1/4 sheet disc fits 1/4 sheet clip-on power sanders. For heavy sanding or stripping. Can be used on many surfaces, including wood, metal and fiberglass. Will not discolor sanding surface. Backing is coated with durable Cubitron abrasive grain (ceramic aluminum oxide) resulting in a more consistent sanded surface. Tear and clog resistant. 4.5" x 5.5". 4 sheets per package.