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The Spyderco Calypso 3.5 Carbon Fiber PlainEdge Folding Knife with ZDP-189 Blade C144CFPE is the ultimate outdoors knife. The Spyderco Caly 3.5 Tactical Folding Knife, with its high-end laminated ZDP-189 blade steel with buffed carbon fiber handle is a variation of the knife that converted legions of knife buyers to the hard-use benefits of flat-ground leaf-shaped blades. This excellent Knife from Spyderco's ZDP-189 blade steel contains 3% carbon, making it harder, higher on the Rockwell scale and in turn extending the amount of time it stays sharp. The Sypderco Calypso 3.5 Folding Pocket Knife comes with a PlainEdged that is ground flat for precise cutting. The handle's shape settles the index finger on the underside and thumb naturally above on the jimped (slip resistant) spine so the knife feels like part of the hand with controlled grip and no forward or backward slide while cutting. Don't cut anything with out the Spyderco Caly Plain Edge Survival Folding Knife.