The Hook-It Conversion Face has a peel-off backing to that sticks to a clean 4 1/2in.-5in. backing pad. The fuzzy Hook-It face allows the abrasive films to be easily attached. The Abrasive Films are also available separately. Use (40030B) for the Coarse A35 Abrasive Pad, (40030C) for the Medium A10 Abrasive Pad, and (40030D) for the Fine A5 Abrasive Pad.