Woodworker’s Hardware stocks a full array of sanding discs with PSA (Pressure Sensitive Adhesive) backing which will easily stick to the backup pad on your orbital palm sander. These PSA discs come in different backings: paper, cloth and film each having unique properties for specific purposes. With the many grits available and even options for discs with holes to use with a vacuum system you will be able to prepare your project for a perfect finish.