Gator 4-Pack 5" 150 Grit Aluminum Oxide Sanding Discs are made of quality red resin and are designed specifically for power tools. They can be used on wood, metal, drywall, fiberglass, and painted surfaces. They fit 5" backer pads and the stick on adhesive holds securely without slipping so you can smooth large surfaces. The resin is bonded to resist heat and humidity for longer life. The anti-clog stearate coating reduces particle build up, keeping the high performance grain exposed longer. Gator Stick-on sanding discs are designed to tackle any sanding challenge. Offered in the most popular sizes to fit portable disc or stationary sanders, you will find the right size for your tool. The wide grit range takes you from start to finish.