Presicion Sharpening Stone：With one thick grit size face for rough grinding and the other fine grit size for finishing, such an sharpening stones normally made of the black silicon carbide or green silicon carbide or brown fused aluminum oxide or white fused aluminum oxide with vitrified bond.

Rubbing brick & sharpening bar：Rubbing brick & sharpening bar are made of the black silicon carbide and green silicon carbide with vitrified bond and are available for processing all kind of stone materials and floors.