1/2 X 18 Inch Premium Zirconia Air File Sanding Belts, 10 Pack. Zirconia Alumina (Z/A), closed coat, heavy duty Y weight polyester cloth backing. High quality and long lasting industrial abrasive sanding belts provide a sharp and long lasting cut on Non Ferrous metals (Aluminum and Titanium) and Ferrous metals (steel, cast iron, carbon steel, tool steel, stainless steel, nickel alloy, etc.) . Heavy duty Y-wgt material provides extra strength for weld removal and grinding applications. Material is deigned for air file portable sanders. Resin over resin bonding. Bi-directional tape joint. Wet or Dry applications. Assembled in America.