(FG) Friction Grip White / Coarse & Fine : Composites : 5,000 - 30,000 rpm max -- These high grade abrasives are for grinding on composites and ceramics NTI® Abrasives are available in green, brown, pink, and white for grinding on materials such as ceramics, metals, and composite. Available in a variety of shapes and sizes. Available in packs of 12 or 100.