From the Manufacturer
The Dremel 1/2-Inch Sanding Band is ideal for rough-shaping and smoothing wood and fiberglass, as well as removing rust from metal and shaping rubber surfaces. This cylinder sanding band is covered with coarse 60-grit aluminum oxide abrasive. This purple sanding band is easily replaceable and comes in a pack of six.
6 Pack, Coarse Sanding Bands.