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This Ultralight Micro Knife Breathes New Life Into the Keychain Category

Counterintuitive as it may seem, the design also deploys more quickly and cleanly than its folding brethren do.

Small cylindrical black carbon fiber object with metallic ends resting on a fingertip.YSmart London
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By Steve Mazzucchi

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As much as I and many others love big, beefy EDC knives that can tackle just about anything, we sometimes overlook one fundamental truth.

Which is that for probably 90 percent of everyday tasks (in a non-outdoors context), a much smaller blade will absolutely suffice.

Three cylindrical carbon fiber keychain holders in green, black, and blue patterns, with one holder open showing a small metal tool inside.
Assuming it meets its stretch goals, the Z3RO will be available with Volt Green, Stealth Black and Neo Blue sheaths.
YSmart London

That’s where keychain EDC knives can come in so handy, especially when they are light, quick, sharp and durable. 

Packing all those qualities and more is YSmart London’s latest Kickstarter project, the Z3RO Micro Knife.

Speed freak

When it comes to bigger knives, a folder can be as fast as a fixed blade, as the latter must be removed from a sheath. 

It is typically also a bit more convenient to carry, as you can easily drop it in a pocket as opposed to mounting it to a belt. 

Hand holding a small cylindrical black and blue carbon fiber keychain or pendant with a hole at the top.
At less than two inches long, this slim reaper is definitely one of the more compact cutting edges you’ll find.
YSmart London

However, when we get down to the keychain size, the Z3RO’s edge (excuse the pun) over a folder like the beloved WESN Microblade begins to emerge. 

As quickly as that knife deploys, it remains attached to the keychain, which can make things clunky and cumbersome. 

Black compact utility knife with a small sharp blade and carbon fiber textured handle held in two hands.
Deploying the blade is as simple as a quick pull on the exposed back end of the handle.
YSmart London

Measuring less than two inches long and weighing less than 0.4 ounces, the Z3RO operates differently.

The sheath’s internal neodymium magnetic system protects the bladed portion while also releasing it in a flash with one firm tug. 

ysmart z3ro micro knife
This GIF nicely shows how swiftly and smoothly the tiny blade deploys.
YSmart London

Despite its impossibly tiny size and low weight, the Z3RO is no joke. The replaceable blade is made of tungsten alloy, the same material used in surgical tools and industrial cutters.

YSmart London has experience with it, too, having tapped the same well for its Bitz tiny knife earlier this year.

Black and green woven-pattern keychain attached to a textured olive-green fabric loop.
The outside of a pack is just one of many places you can stash the Z3RO until you need it.
YSmart London

The sheath, meanwhile, is constructed of 3K twill weave carbon fiber with a titanium core. That gives it natural resistance to corrosion, impact and everyday wear and tear. 

In other words, attach this small wonder to your keychain, pack or necklace, and it can be your EDC cutting companion for decades to come. 

Availability and pricing

The Z3RO Micro Knife is available now on Kickstarter at the early bird price of $74. Estimated delivery is March 2026.

Black and green textured cylindrical handle lying next to a black metal chisel blade standing upright on a wooden surface.YSmart London

YSmart London Z3RO Micro Knife

Measuring less than two inches long and weighing less than 0.4 ounces, the Z3RO is one small but potent keychain knife. The sheath’s internal neodymium magnetic system protects the bladed portion while also releasing it in a flash with one firm tug. The replaceable blade is made of tungsten alloy, the same material used in surgical tools and industrial cutters. The sheath, meanwhile, is constructed of 3K twill weave carbon fiber with a titanium core, giving it natural resistance to corrosion, impact and everyday wear and tear.
About the Author:

Now managing editor, Steve has served in a variety of roles with GP since 2019. Having previously written and edited for such publications as Men’s Health, Men’s Journal, Esquire and ESPN, he enjoys covering a range of topics — but mostly those pertaining to cycling, snow sports, pocket knives and motos — and dreams of a utopian world in which everyone’s bike seat is at the proper height.

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