green silicon carbide sharpening stone black in color,high hardness,highly brittle,sharp abrasive grain,good heat conductivity 1.green silicon carbide sharpening stone2.high quality, better price3 ... produced according to your design. Itemfeaturesmain applicationnormal specificationGreen Carborundum (GC)Green in color,high hardness,brittle,sharp edges grain, heat conductivityapply ...