For use on wood, metal, drywall, fiberglass, and painted surfaces. For use on bench top belt/disc sanders. No. 3037: Disc Size: 7", Grit: 100, Grain: Aluminum Oxide, Backing Material: Adhesive, Pkg Qty: 2, Package Type: Hang Tag No. 3026: Disc Size: 8", Grit: 80 & 120, Grain: Zirconium Oxide, Backing Material: Adhesive, Pkg Qty: 2, Package Type: Card Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!