Coarse is blue, 45 micron / 325 meshFAST: Hardest material, most efficient sharpening abrasive; available in unique interrupted surface and continuous surface
Remove work-hardened burrs created by man-made snow, rocks and ice. Maintain your edge on the slopes with just a few strokes with the Mini Diamond Ski & Snowboard Stone.XX-Extra Extra-Coarse (Silver - 120 micron / 120 mesh); C-Coarse (Blue 45 micron/ 325 mesh)
EASY: Light pressure produces a sharp edge with just a few strokes
CLEAN: Use water for lubrication- no oil, smell or mess
VERSATILE: Hones ALL hard materials: carbide, steel, etc
DURABLE: Starts flat, stays flat - provides years of consistent, reliable use
Made in USA See 'Ships Direct from Manufacturer's link for warranty and return details.