3M™ Cubitron™ II Flap Disc 969F is made with layers of abrasive material. Our flap discs are unique in design and feature a fast cutting abrasive material on flaps of tough polyester cloth. These discs come with a grinding aid and semi-flexible, Y-weight, backing gives each flap excellent strength.For metal grinding and finishing, use 3M™ Cubitron™ II F