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 fine 120-grit aluminum oxide abrasive. This purple sanding band is easily replaceable and comes in a pack of six.
For rough shaping and smoothing wood and fiberglass; removing rust from metal surfaces; and shaping rubber surfaces. Easily replaceable on drums. Do not run in excess of 30,000 RPM.