RECOMMENDED USE: For use on Metal (Ferrous and/or non-ferrous metals, cast iron), Stainless (Stainless steel, high tensile alloys), Aluminum and Wood (Soft and/or hard woods)FEATURES: Economy aluminum oxide, closed coat. X-weight cotton backing. For low cost sanding and finishing of ordinary and alloyed steels, ferrous and non ferrous metals, cast iron and wood. A good choice where price and best value is the determining factor. Each package of belts is shrink-wrapped in quantities of 10.COMPATIBILITY: Portable SanderSPECIFICATIONS: 3" width, 21" length, 80 grit