cup wheel for stone made by black silicon carbide with resin bond, cup wheel,resin cup ... grinding and polishing stone,marble,granite,floor,and etc.Popular size:4" x 2" x 5/8"--115" x 2" x ... "--11Materials:C (Black Silicon Carbide)GC (Green Silicon Carbide)Grit Size:24#,36#,46#,60#,80#,120#......Bond:Resin Bond ( B ...