Compo-Blitz Diamond-Impregnated Natural Felt Wheels - 1.5mm Thickness, 10mm Diameter, 12/Pk. Buff composites, ceramic and porcelain to a high-luster finish, no additional polishing compound needed. Disposable wheels polish in only 15 seconds with light pressure. Soft felt composition works at a low friction temperature of 82 degree F and naturally contours to tooth surfaces. Pre-mounted for contra-angle RA at 5000 rpm. 12 wheels