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 4-1/2 inch x 5-1/2 inch x 3/16 inch Carded