The 3M™ Hookit™ Film Disc 360L features an aluminum oxide abrasive grain on a film backing for effective fine sanding on plastics, gel coats, and polyurethane solid surface substrates. The sturdy film backing gives the durability needed for a high-production environment, and also offers excellent resistance to edge tearing to extend disc life.This disc's film backing gives you a close-tolerance, consistent finish, making it a good choice for applications such as spot repairs, sanding plastic parts, paint feathering on defects, or sanding automotive primer. To help reduce loading, this disc features closed coat construction with a load-resistant stearate coating. The convenient 3M Hookit Attachment on the back enables easy re-use so the disc can be used again and again for the life of the product. It also attaches to the low-profile 3M Hookit Disc Pad (sold separately) on a random orbital sander. The 3M Hookit Film Disc 360L comes in a range of grades for various applications from fine sanding to finishing.