15" No Hole Abrasive Sanding Discs. 100 grit. Metalworking Aluminum Oxide. Closed coat, Heavy X weight Ploy Cloth backing. Sold in Packs of 1. High quality and long lasting industrial abrasive metalworking sanding discs work great on automotive applications, non ferrous metals (Aluminum, Copper, Titanium, Nickel). Heavy duty X-wgt material provides extra strength for working with metal. Quality stick on PSA backing with release paper to protect adhesive from contaminates allowing for superior grip. Resin over resin bonding. Anti-clogging stearate (provides a better sanding and cleaner working environment). Wet or Dry applications. Assembled in America.