These flexible abrasive pads are made from thin plastic fibers impregnated with abrasive particles. The fibers are compressed together in a “non-woven” (random) pattern. These pads prove exceptionally useful for sanding
woodworking projects, especially between coats of finish. The pads are
often referred to as Scotch-Brite pads (the brand name of one such product).You can purchase them from woodworking suppliers in several grits with their corresponding sandpaper grit or steel wool number.