Use on 5" random orbital sanders only. Use on many surfaces, including wood, metal & fiberglass. Will not discolor your sanding surface. Press disc firmly with a slight twisting motion. Backing is coated with extremely durable cubitron mineral, stays sharp. Resulting in a more consistent sanded surface & longer disc life. Cuts 3 times faster & lasts 3 times longer. Has cubirton mineral that is sharp, durable and long lasting Heavy fiber backing for strong and durable long life Use on wood, oil enamel, latex primer, lacquer, sanding sealer and other coatings Designed for use on random orbital sanders Clog-resistant