These are steel triangles blanketed in a bonding agent then covered in diamond particles. Diamond hard abrasives are recommended when you wish to remove stock, for restoration purposes and to aggressively re-shape, re-bevel and re-profile a cutting edge.
Features
Diamond-impregnated triangular rods for the Spyderco Sharpmaker sharpening system
Aggressively remove steel and are ideal for re-shaping and re-beveling cutting edges
Sharpen all types of edges including serrated edges