Saburr heavy duty carbide toothed burrs are for carving and shaping wood, plastics, plaster and fiberglass at speeds up to 24,000 RPM. The razor sharp carbide teeth are arranged into a unique open pattern to resist loading while providing rapid stock removal and a smooth finish.
Clean them out with a wire brush or  card when they begin to clog; for extreme cases you can heat with a butane torch and wire brush 

Burrs for the serious carver