Spyderco YoJumbo Cobalt Blue

Michael Janich's YoJumbo builds on the success of his trendsetting Yojimbo 2 design, scaling it up by more than 20 percent and refining its ergonomics to fit a wider range of hand sizes. The newest expression of this formidable design renders its dramatic Wharncliffe blade in Spyderco's proprietary CPM SPY27 blade steel. This cobalt-enriched particle-metallurgy stainless steel is exclusive to Spyderco knives and delivers an outstanding balance of toughness, edge retention, and corrosion resistance. The deeply hollow-ground blade of the YoJumbo takes full advantage of these qualities and includes Spyderco's signature Trademark Round Hole, configured for either-hand use. Its handle is built on a framework of skeletonized stainless-steel liners that minimize weight while providing a solid foundation for its high-strength Compression Lock mechanism. The liners are nested within coarse peel-ply-textured G-10 scales that proudly showcase a cobalt-blue color-one of the signature handle colors of Spyderco's CPM SPY27 family. For configurable carry, the handle includes a four-position pocket clip that is configurable for tip-up or tip-down carry on either side of the body.

Knife Lover Notes

• Why it stands out: The combination of CPM SPY27 blade steel, a wharncliffe profile, and Compression Lock gives this knife a clearly defined working purpose.
• What it feels like: A carry-focused folder designed for secure handling, controlled use, and regular maintenance.

Sharpening Advice from Apex Edgeworks

CPM SPY27 is a wear-resistant steel best maintained with diamond or ceramic abrasives. Use light pressure and regular touch-ups so the edge does not require heavy reprofiling.

Maintain Your Edge

Every knife purchased from Apex Edgeworks can be professionally resharpened when the edge eventually wears down. Our sharpening service restores proper edge geometry and cutting performance using professional sharpening systems.

Learn about Apex Edgeworks sharpening services →

Recommended maintenance tools:

• Whetstones
• Pocket sharpeners
• Strops

Browse Apex Edgeworks maintenance tools →

Specifications