Radial Bristle Discs have thin flexible bristles that get into hard to reach areas. Aluminum oxide abrasive embedded throughout the bristles enable them to work faster and last longer than conventional sanders, rubber wheels, brushes or cloth buffs. They remove the "fuzzies" without harming the underlying detail on your carvings. The coarse grits can be used to carve and texture while the finer grits will smooth, burnish and polish. Discs are sold in packages of 6. Mandrels sold separately. 5000 RPM max speed.