Joysun Purple DC cleaning and strip-it discs are produced with high quality synthetic nylon web fiber that is coated in premium grade coarse silicon carbide grains. This kind of depressed center cleaning discs is suitable for use on angle grinders. The flexibility and open structure of the depressed center discs will provide the abrasive tool with exceptional grinding effects and durability, leaving no residue on workpieces. Joysun Cleaning & strip-it discs work best at recommended peripheral speeds.