Premium aluminum oxide blend, a superior quality formulation designed for fast material removal and long sanding life. Premium hook and lock backing enables repeated attachment and removal of discs for a consistent secure connection. Clog-Shield, high performance stearate coating that reduces pitch build-up and clogging for maximum productivity. Endura-Bond, a specialized high strength resin provides ideal grit-to-backing bond for extreme durability. For use on wood, metal and plastics.