1" X 42" Premium Sanding Belts designed for knife makers in mind. Includes one each of Zirconia P36, P40, P60, P80, P120 and Aluminum Oxide P150 Grit for a total of 6 belts. Zirconia is specifically designed for heavy grinding and hogging of hardened metals, such as steel. Our closed Aluminum Oxide (A/O) is a long lasting industrial abrasive that provides the best cut for knife shaping, knife sharpening, and general metalworking. Resists loading. Resin over resin bonding. Bi-directional tape joint. Water resistant for wet or Dry applications. Assembled in America