Carborundum Premier Red abrasives set the standard for quality and performance for any sanding application. Constructed of a heat treated aluminum oxide grain plus a grinding aid, Carborundum Premier Red Abrasives provide a cool cut giving long life and freeness of cut on a wide range of materials. Whether you are working on metal, plastics, fiberglass, paints, primers or wood, Premier Red Abrasives offer a 30% to 50% faster cut rate than other competitive discs.