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 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.