3M Resinite Floor Surfacing Discs are precut. Sharp, fast-cutting synthetic mineral with a tough, flexible paper or combination backing. These discs save time and deliver a better value, better finish, and longer life.3M Regalite Floor Surfacing Discs 09271, 7 in x 7/8 in, 752I, 36 Grit, 200/case. Regalite Paper discs run cool, cut faster and last longer than conventional discs. The specially engineered grit provides a consistent, uniform cut throughout its life, ensuring a professonal finish every time. Regalite discs save time, boosting productivity. The trademarked purple abrasive is the standard for excellence in floor sanding discs. Initial sanding with a coarse grit, grade 36 abrasive flattens the wood and removes scratches and gouges, but leaves "peaks and valleys".