OPEN-LOK™ 3-1/2" Sanding Pad & Paper Var Set. It includes a 3-1/2" sanding pad and a variety of sandpaper grits. The pad is made of durable foam and has a hook and loop backing for easy attachment of sandpaper. The sandpaper grits included are 60, 80, 100, 120, 150, 180, 220, 240, 320, 400, 600, and 800.