The 3.5" pad size reduces polisher chatter, which makes the polishing action smoother. Cut and Buff the most difficult oxidized automotive coatings, hardest clear coats and color sanding scratches, then polish the finish to bring out the highest level show car of shine. Pads have a recessed backing with curved plastic reinforced inner edges, which prevents contact between the backing plate and the working surface, so your can buff and polish in tight spaces.