4 X 27 Inch Multipurpose Sanding Belts, 6 Pack. Aluminum Oxide (A/O), open coat, heavy x weight polyester/cotton cloth backing. High quality and long lasting industrial abrasive sanding belts provide a sharp and long lasting cut on softwood, hardwood, plastic, metal, composites, etc. Great for general purpose use. Resists loading. Resin over resin bonding. Bi-directional tape joint. Dry applications. Assembled in America.