Joysun portable surface finishing belts are made from premium aluminum oxide abrasive grains. Their chief function is for use with light and heavy-duty portable sanding belt machines. They are suitable for general purpose grinding, blending, finishing and polishing for various steel types, aluminum alloys, brass, copper, zinc bronze, titanium, plastics, wood, etc. The belts listed are popular stock sizes, but we also provide additional sizes and specifications as requested and we are always willing to customize for clients with unique needs.