It's 4000 grit that comes in a 50ft roll. Awsome stuff if used correctly. It can also be used wet or dry. I'm getting to the point where I'm using this on every car now. 1 small piece can easily sand down 15 vehicles. The more you use each piece, the less marring you'll get on the finish. You guys should look into a group buy because a 50ft roll can do 100's, if not 1000's of vehicles.