3 X 79 Inch Premium Zirconia Sanding Belts, 4 Pack. Closed coat, Heavy Y weight Waterproof Cloth backing. High quality and long lasting industrial abrasive sanding belts work great on ferrous metals (Steel, Iron, Alloys), non ferrous metals (Aluminum, Copper, Titanium, Nickel) and hardwood. Super Heavy duty Y-wgt material provides extra strength for working with metal, grinding welds, sharpening, shaping, etc. Great for blade and knife sharpening. Resin over resin bonding. Bi-directional tape joint. Anti-clogging stearate (provides a better sanding and cleaner working environment). Wet or Dry applications. Assembled in America.