{"product_id":"trivisa-koala-ultra-b","title":"Trivisa Koala Ultra-B M390 Blade Titanium Handle Crossbar Lock Folding Knife","description":"\u003cp\u003eMeet the Trivisa Koala Ultra-B, a compact folding knife designed for everyday carry and outdoor adventures. Its 2.56-inch drop-point blade is crafted from M390 powder-metallurgical stainless steel and finished in black stonewash. Known for wear and corrosion resistance, M390 offers strong edge retention; its high hardness may require diamond abrasives for sharpening, and the edge can chip under heavy lateral stress. A titanium handle keeps the knife lightweight, while the crossbar lock secures the blade when open. Ceramic ball bearings support smooth operation. Measuring 5.83 inches overall and 3.27 inches closed, the Koala Ultra-B weighs just 2.44 ounces. Designed by the TRIVISA team, it’s suited to everyday carry and outdoor activities such as hiking, camping, fishing, and hunting.\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: Drop point\u003cbr\u003eBlade Material：M390 steel\u003cbr\u003eBlade Finished：Black Stonewashed\u003cbr\u003eHandle Material: Titanium\u003cbr\u003eLock Style: Crossbar lock\u003cbr\u003eHardness: 60±2HRC\u003cbr\u003eBearing: Ceramic ball bearing\u003c\/p\u003e\n\u003cp\u003eSize:\u003cbr\u003eOverall length-5.83\"(148mm)\u003cbr\u003eBlade length-2.56\" (65mm)\u003cbr\u003eClosed length-3.27\"(83mm)\u003cbr\u003eBlade width-0.98''（25mm)\u003cbr\u003eBlade thickness-0.11''(3mm)\u003cbr\u003eNet Weight: 2.44oz(69g)\u003c\/p\u003e\n\u003cp\u003eUsage: Outdoor survival,EDC,hunting,fishing, hiking and camping\u003c\/p\u003e\n\u003ch2\u003eTrivisa Koala Ultra-B - Black Stonewash M390 Drop Point in Tan Titanium\u003c\/h2\u003e\n\u003cp\u003eThe Trivisa Koala Ultra-B pairs a 2.56 inch \u003ca href=\"\/collections\/m390\"\u003eM390\u003c\/a\u003e drop point in black stonewash with a tan anodized titanium handle, a \u003ca href=\"\/collections\/crossbar-lock-knives\"\u003ecrossbar lock\u003c\/a\u003e and ceramic bearings at 69 g (2.44 oz). More \u003ca href=\"\/collections\/folding-knives\"\u003efolding knives\u003c\/a\u003e at EDCMALL.\u003c\/p\u003e\n\u003ch2\u003eThe All-Round M390 Pocket Knife\u003c\/h2\u003e\n\u003cp\u003eWhere the Butterfly skews urban and the Sloth skews small, the Koala Ultra is the all-rounder: a 2.56 inch M390 drop point at 60+\/-2 HRC with enough belly for food and enough tip for packaging. The tan anodized titanium handle carries milled cutouts, a red thumb stud, and the crossbar lock that makes the whole Trivisa line ambidextrous. At 69 grams and 5.83 inches open it threads the needle between pocket-friendly and work-capable. Compare M390 with \u003ca href=\"\/collections\/cpm-s35vn\"\u003eCPM-S35VN\u003c\/a\u003e, \u003ca href=\"\/collections\/cpm-20cv\"\u003eCPM-20CV\u003c\/a\u003e and \u003ca href=\"\/collections\/magnacut\"\u003eMagnaCut\u003c\/a\u003e in the table below.\u003c\/p\u003e\n\u003ch2\u003eWhy the Koala Ultra-B Belongs in Your Pocket\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2.56 inch Bohler M390 drop point at 60+\/-2 HRC with a flat grind.\u003c\/li\u003e\n\u003cli\u003eBlack Stonewash blade finish - a dark tumble treatment that reads black in low light and grey at the wear points.\u003c\/li\u003e\n\u003cli\u003eTan anodized titanium handle with milled weight-reduction cutouts.\u003c\/li\u003e\n\u003cli\u003eCrossbar lock: ambidextrous, dirt-tolerant and finger-safe on closing.\u003c\/li\u003e\n\u003cli\u003eCeramic ball bearing pivot for a glassy swing.\u003c\/li\u003e\n\u003cli\u003eRed anodized thumb stud and hardware accents.\u003c\/li\u003e\n\u003cli\u003eSteel pocket clip, tip-up.\u003c\/li\u003e\n\u003cli\u003e69 g (2.44 oz) on a 5.83 inch frame - the all-round M390 carry.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eBest Uses for the Koala Ultra-B\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDaily pocket duty: mail, packaging, food prep on a deep-bellied drop point.\u003c\/li\u003e\n\u003cli\u003eOutdoor day hikes and camp kitchen duty with a corrosion-proof blade.\u003c\/li\u003e\n\u003cli\u003eOffice carry with a tan titanium finish that reads as fine hardware.\u003c\/li\u003e\n\u003cli\u003eCollection building across the black stonewash, satin and mirror variants.\u003c\/li\u003e\n\u003cli\u003eGift for a user who wants one premium do-everything folder.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat steel is the blade?\u003c\/strong\u003e\u003cbr\u003eBohler M390 powder-metallurgy stainless at 60+\/-2 HRC. First-class edge retention and corrosion resistance; sharpen on diamond and keep pry loads off the tip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy a drop point?\u003c\/strong\u003e\u003cbr\u003eThe spine slopes gently to the tip, giving a strong protected point plus a deep belly for slicing - the most versatile all-round blade profile.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the handle material?\u003c\/strong\u003e\u003cbr\u003eTan anodized titanium - aerospace-grade scales coloured by a surface oxide layer, not paint, with milled cutouts for weight and grip.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow does it open and lock?\u003c\/strong\u003e\u003cbr\u003eThe red anodized thumb stud swings the blade out on ceramic ball bearings; the crossbar lock wedges behind the tang and releases with a pull of the bar.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow big is it?\u003c\/strong\u003e\u003cbr\u003e5.83\" (148 mm) open, 3.27\" (83 mm) closed, 2.56\" (65 mm) blade at 0.11\" (3 mm), and 69 g (2.44 oz).\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 titanium-frame folders around premium steels with a clean in-house design language.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eKoala Ultra\u003c\/strong\u003e\u003cbr\u003eTrivisa's compact M390 drop-point folder: 2.56 inch blade, tan anodized titanium handle, crossbar lock, ceramic bearings, 69 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\u003eDrop Point\u003c\/strong\u003e\u003cbr\u003eA blade profile whose spine slopes down to the tip, leaving a deep belly for slicing and a strong point protected by the drop.\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\u003eAnodized Titanium\u003c\/strong\u003e\u003cbr\u003eTitanium colour produced by heat or voltage, forming a surface oxide layer. It is not paint - it will not chip or peel.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eBlack Stonewash Finish\u003c\/strong\u003e\u003cbr\u003eA dark stonewashed treatment that reads black in low light and grey at the wear points. Hides scratches better than any 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\u003cstrong\u003eMirror Polish\u003c\/strong\u003e\u003cbr\u003eA fully polished blade surface that reflects like glass. Stunning under light, but it shows micro-scratches - wipe it clean and store it dry.\u003cbr\u003e\u003cbr\u003e\n\u003ch2\u003eWho Should Buy the Koala Ultra-B\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBuyers who want one premium do-everything M390 folder.\u003c\/li\u003e\n\u003cli\u003eFans of tan anodized titanium and the milled cutout look.\u003c\/li\u003e\n\u003cli\u003eUsers who want a drop point's versatility at powder-steel edge life.\u003c\/li\u003e\n\u003cli\u003eGift shoppers looking for a polished, boxed-feeling piece.\u003c\/li\u003e\n\u003cli\u003eCollectors choosing between black stonewash, satin and mirror variants.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho Should Skip It\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUsers with large hands - the 3.27 inch closed frame is compact.\u003c\/li\u003e\n\u003cli\u003eBudget-first buyers; M390 and titanium put this in premium territory.\u003c\/li\u003e\n\u003cli\u003eAnyone who wants a flipper or button action; this opens on a thumb stud.\u003c\/li\u003e\n\u003cli\u003ePry-prone users - 3 mm M390 is a slicer, not a lever.\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 Koala Ultra-B M390 Blade Titanium Handle Crossbar Lock Folding Knife\",\n  \"sku\": \"Koala Ultra-B\",\n  \"mpn\": \"Koala Ultra-B\",\n  \"productID\": \"Koala Ultra-B\",\n  \"description\": \"Trivisa Koala Ultra-B folding knife: 2.56 inch Bohler M390 drop point blade at 60+\/-2 HRC with a black stonewash finish, tan anodized titanium handle with milled cutouts, crossbar lock, ceramic ball bearing pivot, red anodized thumb stud opening, steel pocket clip, 69 g, 5.83 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\": 69, \"unitCode\": \"GRM\" },\n  \"category\": \"Knives\",\n  \"additionalProperty\": [\n      { \"@type\": \"PropertyValue\", \"name\": \"Brand\", \"value\": \"Trivisa\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Model\", \"value\": \"Koala Ultra-B\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Model Number\", \"value\": \"Koala Ultra-B\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Product Type\", \"value\": \"Folding Knife\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Material\", \"value\": \"M390\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Handle Material\", \"value\": \"Tan Anodized Titanium\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Lock Type\", \"value\": \"Crossbar Lock\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Style\", \"value\": \"Drop Point\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Grind\", \"value\": \"Flat\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Finish\", \"value\": \"Black Stonewash\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Overall Length\", \"value\": \"5.83\\\" (148 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Length\", \"value\": \"2.56\\\" (65 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Blade Thickness\", \"value\": \"0.11\\\" (3 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Closed Length\", \"value\": \"3.27\\\" (83 mm)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Weight\", \"value\": \"69 g (2.44 oz)\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Designer\", \"value\": \"TRIVISA Team\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Opening\", \"value\": \"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\": \"Koala Ultra-B\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Price\", \"value\": \"145.99\" },\n      { \"@type\": \"PropertyValue\", \"name\": \"Availability\", \"value\": \"InStock\" }\n  ],\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/edcmall.cn\/products\/trivisa-koala-ultra-b\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"145.99\",\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":50881727135941,"sku":null,"price":145.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0584\/0699\/4117\/files\/01_c87dcc72-0e4a-45a7-b66a-86a39e7711df.jpg?v=1793859570","url":"https:\/\/edcmall.cn\/products\/trivisa-koala-ultra-b","provider":"EDCMALL","version":"1.0","type":"link"}