{"product_id":"trivisa-firefly-ultra-rg-yd04-rg-m","title":"Trivisa Firefly Ultra-RG YD04-RG-M M390 Blade Titanium Handle Crossbar Lock Folding Knife","description":"\u003cp\u003eDesigned by the TRIVISA team, the Firefly Ultra-RG YD04-RG-M pairs a compact folding profile with premium materials for everyday carry and outdoor activities. Its 2.99-inch M390 stainless steel blade features a rose-gold PVD finish and a swedge profile. Known for wear and corrosion resistance, M390 helps the edge stay sharp through regular use; its high hardness may require diamond abrasives for sharpening. A titanium handle keeps the knife lightweight, while the crossbar lock and ceramic ball bearings support smooth operation and secure handling. At 6.69 inches overall and 3.07 ounces, it fits easily into a pocket or pack. Consider it for camping, hiking, fishing, hunting, or general utility tasks. Blade hardness is rated at 60 ± 2 HRC, with a 0.13-inch blade thickness.\u003c\/p\u003e\n\u003ch2 class=\"product-title\"\u003e\u003cstrong\u003eM390 Blade Introduction\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/edcmall.cn\/collections\/m390\"\u003eM390\u003c\/a\u003e is an advanced powder-metallurgical stainless steel utilizing high chromium and vanadium content to deliver exceptional wear resistance and industry-leading corrosion resilience. It excels at retaining a razor-sharp edge under prolonged use; however, this extreme hardness renders the blade notably difficult to sharpen or reprofile without diamond abrasives. Additionally, its fine microstructure, while offering superior edge stability, sacrifices some structural toughness and may be more prone to chipping under heavy lateral stress.\u003c\/p\u003e\n\u003ch2 class=\"MsoNormal\"\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003eDesigner:TRIVISA Team\u003cbr\u003eStyle:Swedge\u003cbr\u003eBlade Material: M390 Steel Blade\u003cbr\u003eBlade Finished: Rose gold PVD\u003cbr\u003eHandle Material:Titanium Handle\u003cbr\u003eLock Style:Crossbar Lock\u003cbr\u003eHardness:60±2HRC\u003cbr\u003eBearing:Ceramic Ball Bearing\u003c\/p\u003e\n\u003cp\u003eSize:\u003cbr\u003eOverall length-6.69\"(171mm)\u003cbr\u003eBlade length-2.99\"(76mm)\u003cbr\u003eClosed length-3.7\"(95mm)\u003cbr\u003eBlade width-0.9''(23mm)\u003cbr\u003eBlade thickness-0.13''(3mm)\u003cbr\u003eNet Weight:3.07oz(87g)\u003c\/p\u003e\n\u003cp\u003eUsage:Outdoor survival,EDC,hunting,fishing, hiking and camping\u003c\/p\u003e\n\u003ch2\u003eTrivisa Firefly Ultra-RG - Rose Gold PVD M390 Swedge Blade in a Fluted Titanium Frame\u003c\/h2\u003e\n\u003cp\u003eThe \u003ca href=\"\/es\/collections\/m390\"\u003eM390\u003c\/a\u003e swedge blade on the Trivisa Firefly Ultra-RG is finished in rose gold PVD, riding on a dark grey fluted titanium handle with a \u003ca href=\"\/es\/collections\/crossbar-lock-knives\"\u003ecrossbar lock\u003c\/a\u003e and ceramic bearings at 87 g (3.07 oz). More \u003ca href=\"\/es\/collections\/folding-knives\"\u003efolding knives\u003c\/a\u003e and \u003ca href=\"\/es\/collections\/edc-all-products\"\u003eEDC gear\u003c\/a\u003e at EDCMALL.\u003c\/p\u003e\n\u003ch2\u003eM390 Behind a Fluted Titanium Frame Built for Daily Carry\u003c\/h2\u003e\n\u003cp\u003eThe Firefly Ultra puts Bohler M390 - the powder-metallurgy benchmark with roughly 20 percent chromium and a dense vanadium carbide field - behind a 2.99 inch swedge blade on 3.0 mm stock, hardened to 60+\/-2 HRC. That is a month of packaging and cord duty between touch-ups, with corrosion resistance that laughs at sweaty pockets and wet weather. The fluted titanium scales are machined with a groove-and-rivet relief that indexes your fingers and cuts glare, and the crossbar lock plus ceramic bearing pivot keep the action crisp at 87 g (3.07 oz). Compare M390 with \u003ca href=\"\/es\/collections\/cpm-s35vn\"\u003eCPM-S35VN\u003c\/a\u003e, \u003ca href=\"\/es\/collections\/cpm-20cv\"\u003eCPM-20CV\u003c\/a\u003e and \u003ca href=\"\/es\/collections\/magnacut\"\u003eCPM-MagnaCut\u003c\/a\u003e in the table below.\u003c\/p\u003e\n\u003ch2\u003eWhy the Trivisa Firefly Ultra Belongs in Your Pocket\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2.99 inch Bohler M390 swedge blade at 60+\/-2 HRC on 3.0 mm stock.\u003c\/li\u003e\n\u003cli\u003eRose Gold PVD blade finish - a hard warm-copper PVD layer that reads jewellery under light.\u003c\/li\u003e\n\u003cli\u003eDark Grey Fluted Titanium machined with a groove-and-rivet flute pattern.\u003c\/li\u003e\n\u003cli\u003eAnodized thumb stud for fast, one-handed opening.\u003c\/li\u003e\n\u003cli\u003eCrossbar lock: ambidextrous, dirt-tolerant and finger-safe on closing.\u003c\/li\u003e\n\u003cli\u003eCeramic ball bearing pivot that stays glassy for years.\u003c\/li\u003e\n\u003cli\u003eSteel pocket clip, tip-up, and a lanyard-ready rear.\u003c\/li\u003e\n\u003cli\u003e87 g (3.07 oz) on a 6.69 inch frame - premium steel, honest carry weight.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBest Uses for the Firefly Ultra-RG\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDaily pocket duty: mail, packaging, tags and food prep on a powder-steel edge.\u003c\/li\u003e\n\u003cli\u003eOffice and urban carry where the fluted titanium frame reads as a machined showpiece.\u003c\/li\u003e\n\u003cli\u003eWeekend hiking and camping where corrosion resistance beats a semi-stainless workhorse.\u003c\/li\u003e\n\u003cli\u003eCollection display for the rose gold PVD or silver bead-blast finish pairing.\u003c\/li\u003e\n\u003cli\u003ePrecision slicing tasks where the swedged tip and fine M390 edge earn their keep.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat steel is the Firefly Ultra blade?\u003c\/strong\u003e\u003cbr\u003eBohler M390 powder-metallurgy stainless, hardened to 60+\/-2 HRC. It offers first-class edge retention and corrosion resistance; sharpen it on diamond abrasives and keep prying loads off the fine tip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the fluted handle?\u003c\/strong\u003e\u003cbr\u003eDark Grey Fluted Titanium machined with a groove-and-rivet relief pattern - the flutes cut weight, add finger indexing and give the frame a machined industrial look.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does the knife open and lock?\u003c\/strong\u003e\u003cbr\u003ePress the anodized thumb stud and the ceramic ball bearing pivot swings the blade out one-handed; the crossbar lock wedges behind the tang from above and is fully ambidextrous and finger-safe on closing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow big is it?\u003c\/strong\u003e\u003cbr\u003e6.69\" (171 mm) open, 3.7\" (95 mm) closed, 2.99\" (76 mm) blade at 0.13\" (3 mm), and 87 g (3.07 oz) - a compact titanium folder with real blade stock behind the edge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRose gold or silver - which finish should I pick?\u003c\/strong\u003e\u003cbr\u003eThe rose gold PVD reads warm copper under lamplight; the bead-blast silver is the stealth option that hides scratches best. Both blades are the same M390 steel.\u003c\/p\u003e\n\u003ch3\u003eBohler M390 vs. Common Pocket Knife Steels\u003c\/h3\u003e\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSteel\u003c\/th\u003e\n\u003cth\u003eTypical HRC\u003c\/th\u003e\n\u003cth\u003eEdge Retention\u003c\/th\u003e\n\u003cth\u003eCorrosion Resistance\u003c\/th\u003e\n\u003cth\u003eToughness\u003c\/th\u003e\n\u003cth\u003eSharpening Ease\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBohler M390 (this knife)\u003c\/td\u003e\n\u003ctd\u003e60-62\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eFair\u003c\/td\u003e\n\u003ctd\u003eHard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCPM-20CV\u003c\/td\u003e\n\u003ctd\u003e61-62\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eFair\u003c\/td\u003e\n\u003ctd\u003eHard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCPM-MagnaCut\u003c\/td\u003e\n\u003ctd\u003e62-63\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCPM-S35VN\u003c\/td\u003e\n\u003ctd\u003e58-60\u003c\/td\u003e\n\u003ctd\u003eVery Good\u003c\/td\u003e\n\u003ctd\u003eVery Good\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e154CM\u003c\/td\u003e\n\u003ctd\u003e58-61\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eVery Good\u003c\/td\u003e\n\u003ctd\u003eModerate\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e14C28N\u003c\/td\u003e\n\u003ctd\u003e58-61\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eVery Easy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8Cr13MoV\u003c\/td\u003e\n\u003ctd\u003e57-59\u003c\/td\u003e\n\u003ctd\u003eFair\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003ctd\u003eVery Easy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eBohler M390 is an Austrian powder-metallurgy stainless in the same class as CPM-20CV and CTS-204P: roughly 1.9 percent carbon and 20 percent chromium-carbide-forming alloy deliver first-class edge retention and near-saltwater corrosion resistance. Hardened to 60+\/-2 HRC, it holds a working edge for weeks of packaging and cord duty, but the dense carbide volume means sharpening wants a diamond plate and the fine apex can chip under prying loads. HRC figures are typical mill ranges, not a guarantee for any single blade.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eGlossary of Key Terms\u003c\/h2\u003e\n\u003cstrong\u003eTrivisa\u003c\/strong\u003e\u003cbr\u003eA Chinese knife brand building textured titanium folders around premium steels, with a clean in-house design language.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFirefly Ultra\u003c\/strong\u003e\u003cbr\u003eTrivisa's compact M390 swedge folder: a 2.99 inch blade at 60+\/-2 HRC, fluted titanium handle, crossbar lock, ceramic bearings, 87 g.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eM390 Steel\u003c\/strong\u003e\u003cbr\u003eBohler's Austrian powder-metallurgy stainless in the 20CV\/204P class: first-class edge retention, near-saltwater corrosion resistance, and a taste for diamond sharpening stones.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eSwedge\u003c\/strong\u003e\u003cbr\u003eA bevel ground along the blade spine. It lightens the profile, sharpens the tip's geometry and adds a distinctive silhouette.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCrossbar Lock\u003c\/strong\u003e\u003cbr\u003eA spring-loaded bar spanning the handle that wedges behind the blade tang. Fully ambidextrous, keeps fingers out of the closing path, and among the strongest folder locks built.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCeramic Ball Bearings\u003c\/strong\u003e\u003cbr\u003eHardened ceramic balls around the pivot. The action stays glassy for years, and ceramic will not rust or flat-spot.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eTitanium Handle\u003c\/strong\u003e\u003cbr\u003eAerospace-grade Ti-6Al-4V scales: stronger than steel by weight, immune to corrosion, and warm-feeling in cold weather.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFluted Titanium Handle\u003c\/strong\u003e\u003cbr\u003eTitanium scales machined with groove-and-rivet relief. The flutes cut weight, add grip and give the frame a machined, industrial look.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003ePVD Coating\u003c\/strong\u003e\u003cbr\u003ePhysical vapour deposition: a hard, thin metallic-ceramic layer bonded to the steel. Rose-gold and black finishes resist scratches; edge wear is cosmetic, not structural.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eStonewash Finish\u003c\/strong\u003e\u003cbr\u003eA tumbling process that beads the steel into a uniform matte grey, hiding carry scratches and killing glare far better than satin.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003e60+\/-2 HRC\u003c\/strong\u003e\u003cbr\u003eThe Rockwell C hardness band the blade is heat treated to: hard enough for long edge life, still honest to sharpen at home with patience.\u003cbr\u003e\u003cbr\u003e\n\u003ch2\u003eWho Should Buy the Firefly Ultra-RG\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBuyers who want M390 edge retention in a compact titanium folder.\u003c\/li\u003e\n\u003cli\u003eAnyone who values an ambidextrous crossbar lock over flipper tactics.\u003c\/li\u003e\n\u003cli\u003eCollectors pairing the rose gold and silver variants as a two-knife set.\u003c\/li\u003e\n\u003cli\u003eWet-climate carriers tired of wiping semi-stainless blades dry.\u003c\/li\u003e\n\u003cli\u003eMinimalists who like machined texture over plain slab scales.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho Should Skip It\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBudget-first buyers - a 14C28N folder at a third of the price cuts cardboard just as well.\u003c\/li\u003e\n\u003cli\u003eAnyone who wants a fidget-style flipper or button action; this opens on a thumb stud.\u003c\/li\u003e\n\u003cli\u003eUsers who need a pry bar; the fine M390 swedge tip is a slicer, not a lever.\u003c\/li\u003e\n\u003cli\u003eUltralight chasers - at 87 g with 3.0 mm blade stock, the Sloth Ultra line is lighter.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCare \u0026amp; Maintenance\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eWipe the blade dry after every use; M390 is highly stainless, but the finish lasts longer when wiped clean.\u003c\/li\u003e\n\u003cli\u003eOne drop of light knife oil at the pivot every two to three months, then swing the blade a dozen times so oil reaches the ceramic bearing.\u003c\/li\u003e\n\u003cli\u003eSharpen on a diamond plate or CBN stone at 15-18 degrees per side; M390's vanadium carbides defeat ordinary aluminium-oxide stones.\u003c\/li\u003e\n\u003cli\u003eWork in light passes and finish on a loaded strop - heavy pressure on a 60+\/-2 HRC edge just rounds the apex you set.\u003c\/li\u003e\n\u003cli\u003eDo not pry, twist or use the tip as a screwdriver; the fine M390 apex can chip under lateral load.\u003c\/li\u003e\n\u003cli\u003eWipe anodized titanium scales with a dry microfibre cloth; the colour is a surface oxide, so keep solvents off it.\u003c\/li\u003e\n\u003cli\u003eBlow lint out of the crossbar-lock channel before oiling; grit under the lock bar is the usual cause of a gritty action.\u003c\/li\u003e\n\u003cli\u003eCheck the body and clip screws every few months with the correct Torx driver; vibration on a keyring or pack can back them out.\u003c\/li\u003e\n\u003cli\u003eStore the knife closed and dry, never sealed in a damp pouch against the steel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\/\",\n  \"@type\": \"Product\",\n  \"name\": \"Trivisa Firefly Ultra-RG YD04-RG-M M390 Blade Titanium Handle Crossbar Lock Folding Knife\",\n  \"sku\": \"YD04-RG-M\",\n  \"mpn\": \"YD04-RG-M\",\n  \"productID\": \"YD04-RG-M\",\n  \"description\": \"Trivisa Firefly Ultra-RG YD04-RG-M folding knife: 2.99 inch Bohler M390 swedge blade at 60+\/-2 HRC with a rose gold PVD finish on 3.0 mm stock, dark grey fluted titanium handle machined with a groove-and-rivet flute pattern, crossbar lock, ceramic ball bearing pivot, anodized thumb stud opening, steel pocket clip, 87 g, 6.69 inch overall.\",\n  \"brand\": { \"@type\": \"Brand\", \"name\": \"Trivisa\" },\n  \"manufacturer\": { \"@type\": \"Organization\", \"name\": \"Trivisa\" },\n  \"material\": \"M390, Titanium\",\n  \"color\": \"Multi\",\n    \"weight\": { \"@type\": \"QuantitativeValue\", \"value\": 87, \"unitCode\": \"GRM\" },\n  \"category\": \"Knives\",\n  \"additionalProperty\": [\n      { \"@type\": \"PropertyValue\", \"name\": \"Brand\", \"value\": \"Trivisa\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Model\", \"value\": \"Firefly Ultra-RG\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Model Number\", \"value\": \"YD04-RG-M\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Product Type\", \"value\": \"Folding Knife\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Material\", \"value\": \"M390\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Handle Material\", \"value\": \"Dark Grey Fluted Titanium\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Lock Type\", \"value\": \"Crossbar Lock\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Style\", \"value\": \"Swedge\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Grind\", \"value\": \"Flat\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Finish\", \"value\": \"Rose Gold PVD\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Overall Length\", \"value\": \"6.69\\\" (171 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Length\", \"value\": \"2.99\\\" (76 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Thickness\", \"value\": \"0.13\\\" (3 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Closed Length\", \"value\": \"3.7\\\" (95 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Weight\", \"value\": \"87 g (3.07 oz)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Designer\", \"value\": \"TRIVISA Team\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Opening\", \"value\": \"Anodized thumb stud\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Carry\", \"value\": \"Steel pocket clip, tip-up\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Hardness\", \"value\": \"60+\/-2 HRC\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"SKU\", \"value\": \"YD04-RG-M\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Special Features\", \"value\": \"Fluted groove-and-rivet titanium handle texture\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Price\", \"value\": \"151.99\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Availability\", \"value\": \"InStock\" }\n  ],\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/edcmall.cn\/products\/trivisa-firefly-ultra-rg-yd04-rg-m\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"151.99\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"itemCondition\": \"https:\/\/schema.org\/NewCondition\"\n  }\n}\n\u003c\/script\u003e","brand":"Trivisa Knives","offers":[{"title":"Default Title","offer_id":50883083534533,"sku":"YD04-RG-M","price":151.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0584\/0699\/4117\/files\/01_7a9ee9e5-4cf7-4822-b6b5-a0ce8603cf37.jpg?v=1793871969","url":"https:\/\/edcmall.cn\/es\/products\/trivisa-firefly-ultra-rg-yd04-rg-m","provider":"EDCMALL","version":"1.0","type":"link"}