Description: High toughness and hardness with green carbon material Special tool for widely sharpening work,ideal for ceramic,painted metal,optical glass,jade polishing or sharpening Material:Silicone Carbide Size:Approx.150*12*12mm Granularity:60#,150#,240#,320#,600#,800#,1000#,1200#,1500#,2000# Package Includes: 10 x Green Carbon Oil Stone