HOOK & LOOP DESIGN - hook and loop function for quick pad changes, prevents pad shifting and spinning, yet allows for easy removal of the abrasive disc without wearing out overall strength. WIDELY USED - Perfect to be used with any 5-inch Sanding Discs, sandpapers, abrasive sanding pads, interface pad. Ideal for woodworking, hobby, arts and crafts, auto body, drywall, shop and automotive use. PERFECT SIZE - The base is just the right size for any 5-inch sanding disc is makes it easy to change out discs. The top of the pad includes 3 finger slots for extra grip and even control, MATERIAL - Made from tough polyurethane foam (PU) - quality hook and loop base flexible and very sturdy, to dampen the vibration and Minimizes heat transfer. Lightweight, so you can apply pressure to any wood surface you are sanding without experiencing fatigue.