LONG LIFE AO - We use a premium heat treated aluminum oxide grain which allows the abrasive grain to withstand extra heat and friction while also being able to withstand high pressure grinding applications on metal or wood. CLOTH BELT - Our wide belts are made on a sturdy X-weight Poly-Cotton backing that allows these belts to be run Wet or Dry. Additionally X-weight belts will last 2 - 3X longer than paper belts. SANDING WOOD OR METAL - These 25" x 60" wide belts are optimized for long life and grind ability while giving a smooth, consistent finish on wood, stainless steel, steel, aluminum and many other solid surfaces. SATISFACTION GUARANTEED - We take great pride in the look and performance of our product. We guarantee that our customers will be satisfied or their money back. This is a 4 Pack of 25" wide by 60" long sanding belts that can be used for sanding wood, metal or any other solid surfaces. These belts are made in the USA by Maverick Abrasives using quality control procedures to make sure every belt performs consistently. These belts are cloth backed belts with a resin over resin coating.