Silicon Carbide 99 % Min Green Elements Spec SiC 99% Min Free Carbon 0.2 % Max Fe2O3 0.2 % Max Silicon Carbide 97 % Min Black Elements Spec SiC 97% Min Free Carbon 0.5 % Max Fe2O3 1.0 % Max SiO2 1.5% Max Size:Green, F12-220,F240-2000(FEPA),F240-F8000(JIS),, Black,0-50mm, 0-325MESN ,F12-F220(FEPA),