For use on wood, metal, drywall, fiberglass and painted surfaces. Resin bonded to resist heat and humidity for longer life. These stick-on premium sheets are designed to fit any 1/4 sheet stick-on palm sander. The heavy-duty resin sandpaper resists heat and humidity for longer life. The pressure sensitive holding system holds securely without slipping, tearing or wrinkling, allowing 100% use of the sander's motion.