For easy surface prep of bare wood, metal, or drywall Electrostatically coated ceramic aluminum oxide mineral blend, a tough, durable mineral for increased durability and work life Cuts 3 times faster, lasts 3 times longer Clog resistant, washable Use wet or dry Tough foam backing resists tearing 150 grit 3-3/4 inch x 2-5/8 inch x 1 inch Carded