The Scotch-Brite™ Primer Prep Scuff is a non-woven abrasive that comes in a 4-3/4 in x 15 ft roll with perforations for 4-3/4 in x 6 in pads that allow for easy "downsizing." The most aggressive of a 3-part scuff pad system (PDF, 917 Kb), the Primer Prep Scuff is used to scuff prior to primer for proper mechanical adhesion. The aluminum oxide mineral offers an aggressive and clean cut. A unique non-woven web is the secret to superior performance. It binds together synthetic fibers and abrasive particles to create a conformable, three-dimensional material. Its open structure reduces the risk of warping or discoloring the part, resists loading, improves finish and prolongs the product's life.