Silicon Polishing Bullet - 800 Grit (Blue) Premium silicon-carbide wheels formulated to provide the smoothest finish without the use of messy polishing compounds. This bullet is 1" x 1/4" and is grit 800 (fine). Fine, soft and flexible. For medium lustre or smooth matte finish Operating speed range is 5000 to 10,000 rpm. Supplied as a package of a dozen.