Trivisa Koala Ultra-B M390 Blade Titanium Handle Crossbar Lock Folding Knife

Meet 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.

M390 Blade Introduction

M390 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.

Specification

Designer: TRIVISA team
Style: Drop point
Blade Material：M390 steel
Blade Finished：Black Stonewashed
Handle Material: Titanium
Lock Style: Crossbar lock
Hardness: 60±2HRC
Bearing: Ceramic ball bearing

Size:
Overall length-5.83"(148mm)
Blade length-2.56" (65mm)
Closed length-3.27"(83mm)
Blade width-0.98''（25mm)
Blade thickness-0.11''(3mm)
Net Weight: 2.44oz(69g)

Usage: Outdoor survival,EDC,hunting,fishing, hiking and camping

Trivisa Koala Ultra-B - Black Stonewash M390 Drop Point in Tan Titanium

The Trivisa Koala Ultra-B pairs a 2.56 inch M390 drop point in black stonewash with a tan anodized titanium handle, a crossbar lock and ceramic bearings at 69 g (2.44 oz). More folding knives at EDCMALL.

The All-Round M390 Pocket Knife

Where 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 CPM-S35VN, CPM-20CV and MagnaCut in the table below.

Why the Koala Ultra-B Belongs in Your Pocket

• 2.56 inch Bohler M390 drop point at 60+/-2 HRC with a flat grind.
• Black Stonewash blade finish - a dark tumble treatment that reads black in low light and grey at the wear points.
• Tan anodized titanium handle with milled weight-reduction cutouts.
• Crossbar lock: ambidextrous, dirt-tolerant and finger-safe on closing.
• Ceramic ball bearing pivot for a glassy swing.
• Red anodized thumb stud and hardware accents.
• Steel pocket clip, tip-up.
• 69 g (2.44 oz) on a 5.83 inch frame - the all-round M390 carry.

Best Uses for the Koala Ultra-B

• Daily pocket duty: mail, packaging, food prep on a deep-bellied drop point.
• Outdoor day hikes and camp kitchen duty with a corrosion-proof blade.
• Office carry with a tan titanium finish that reads as fine hardware.
• Collection building across the black stonewash, satin and mirror variants.
• Gift for a user who wants one premium do-everything folder.

Frequently Asked Questions

What steel is the blade?
Bohler 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.

Why a drop point?
The spine slopes gently to the tip, giving a strong protected point plus a deep belly for slicing - the most versatile all-round blade profile.

What is the handle material?
Tan anodized titanium - aerospace-grade scales coloured by a surface oxide layer, not paint, with milled cutouts for weight and grip.

How does it open and lock?
The 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.

How big is it?
5.83" (148 mm) open, 3.27" (83 mm) closed, 2.56" (65 mm) blade at 0.11" (3 mm), and 69 g (2.44 oz).

Bohler M390 vs. Common Pocket Knife Steels

Steel	Typical HRC	Edge Retention	Corrosion Resistance	Toughness	Sharpening Ease
Bohler M390 (this knife)	60-62	Excellent	Excellent	Fair	Hard
CPM-20CV	61-62	Excellent	Excellent	Fair	Hard
CPM-MagnaCut	62-63	Excellent	Excellent	Excellent	Moderate
CPM-S35VN	58-60	Very Good	Very Good	Good	Moderate
154CM	58-61	Good	Good	Very Good	Moderate
14C28N	58-61	Good	Excellent	Good	Very Easy
8Cr13MoV	57-59	Fair	Good	Good	Very Easy

Bohler 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.

Glossary of Key Terms

Trivisa
A Chinese knife brand building titanium-frame folders around premium steels with a clean in-house design language.

Koala Ultra
Trivisa's compact M390 drop-point folder: 2.56 inch blade, tan anodized titanium handle, crossbar lock, ceramic bearings, 69 g.

M390 Steel
Bohler'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.

Drop Point
A blade profile whose spine slopes down to the tip, leaving a deep belly for slicing and a strong point protected by the drop.

Crossbar Lock
A 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.

Ceramic Ball Bearings
Hardened ceramic balls around the pivot. The action stays glassy for years, and ceramic will not rust or flat-spot.

Titanium Handle
Aerospace-grade Ti-6Al-4V scales: stronger than steel by weight, immune to corrosion, and warm-feeling in cold weather.

Anodized Titanium
Titanium colour produced by heat or voltage, forming a surface oxide layer. It is not paint - it will not chip or peel.

Black Stonewash Finish
A dark stonewashed treatment that reads black in low light and grey at the wear points. Hides scratches better than any satin.

60+/-2 HRC
The Rockwell C hardness band the blade is heat treated to: hard enough for long edge life, still honest to sharpen at home with patience.

Mirror Polish
A fully polished blade surface that reflects like glass. Stunning under light, but it shows micro-scratches - wipe it clean and store it dry.

Who Should Buy the Koala Ultra-B

• Buyers who want one premium do-everything M390 folder.
• Fans of tan anodized titanium and the milled cutout look.
• Users who want a drop point's versatility at powder-steel edge life.
• Gift shoppers looking for a polished, boxed-feeling piece.
• Collectors choosing between black stonewash, satin and mirror variants.

Who Should Skip It

• Users with large hands - the 3.27 inch closed frame is compact.
• Budget-first buyers; M390 and titanium put this in premium territory.
• Anyone who wants a flipper or button action; this opens on a thumb stud.
• Pry-prone users - 3 mm M390 is a slicer, not a lever.

Care & Maintenance

• Wipe the blade dry after every use; M390 is highly stainless, but the finish lasts longer when wiped clean.
• One 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.
• Sharpen on a diamond plate or CBN stone at 15-18 degrees per side; M390's vanadium carbides defeat ordinary aluminium-oxide stones.
• Work in light passes and finish on a loaded strop - heavy pressure on a 60+/-2 HRC edge just rounds the apex you set.
• Do not pry, twist or use the tip as a screwdriver; the fine M390 apex can chip under lateral load.
• Wipe anodized titanium scales with a dry microfibre cloth; the colour is a surface oxide, so keep solvents off it.
• Blow lint out of the crossbar-lock channel before oiling; grit under the lock bar is the usual cause of a gritty action.
• Check the body and clip screws every few months with the correct Torx driver; vibration on a keyring or pack can back them out.
• Store the knife closed and dry, never sealed in a damp pouch against the steel.