Mill Rose Cleanfit 70090 Professional Open Mesh Abrasive Cloth, 5 yd length x 1-1/2 inch W, 180/24 Grit, Aluminum Oxide. Mill-Rose original Aluminum Oxide mesh for copper tube cleaning. A fully waterproof product made with open nylon fabric, Phenolic resin adhesive, which makes it waterproof, and rugged aluminum oxide. Coated on both sides of the nylon fabric to produce a long-lasting sharp cutting product. If this material becomes coated (loaded) with copper, brass or other non-ferrous or plastic residue, simply rinse in water or tap against a hard surface to clean.