* 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* 100 grit* 3-3/4" x 2-5/8" x 1"