Consists of tiny, lead-free beads of soda glass that produce a silky luster. Controlled size and shape of the beads make for a high level of usability and therefore, efficient and economical working. No metal is lost because the surface is compressed and not abraded. No finishing is necessary on the surfaces not intended for polishing. It can be used for all standard crown and bridge alloys to give the occlusal surfaces a matte finish.