Silicon Carbide Medium Dressing Stone K10Boride Silicon Carbide Hard Dressing Stone is a maintenance stone for cleaning, refreshing, flattening, and resurfacing sharpening stones in 6" x 1" Edge Pro form factor. It uses Black Silicon Carbide abrasive with Boride K10 vitrified bond. It provides aggressive resurfacing with higher structural stability and more controlled abrasive release. Compared to D10, it releases abrasive more slowly and works primarily through its hard textured surface.