Performance Plus Non-Woven Scuff Pads are an excellent choice for both surface preparations and fine finishing. The Maroon "Very Fine" pads contain an aluminum oxide abrasive and the Gray "Ultra Fine" pads contain a silicon oxide abrasive. Both, Maroon and Gray pads have a phenolic resin special coating to provide a consistant finish. The Flex Pads are thinner to provide more flexability when working in door jambs, corners, or tight areas.