Combines coated and non-woven abrasives which allows you to ?âòÂì?ÓGrind & Finish?âòÂì?Ý with one product reducing time and labor.Cushioned grinding effect allows for effortless blending and finishing of contoured work pieces.Aluminum oxide specifications available in coarse, medium, and very fine.Ceramic specification (High Performance) available in 40 grit and 60 grit ?âòÂìòÀÜ provides exceptionally long life., Ideal for cleaning of weld spatter and light deburring operations.Operate at lower speeds for optimum performance.Optimal RPM 4-1/2" = 4,000.Optimal RPM 5" = 3,500.