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The Spyderco 204D uses Cubic Boron Nitride (CBN), an incredibly hard superabrasive that's only outdone by diamond. This exceptional hardness gives it a higher resistance to wear and better thermal conductivity than traditional abrasives like silicon carbide and aluminum oxide.
It's highly sought after for advanced industrial grinding operations due to these superior properties. With the Spyderco's Tri-Angle Sharpmaker, these high-grade properties of CBN are brought into the convenience of your hands with CBN-coated Sharpmaker rods for swift and efficient cutting.