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 reduces pitch build up and clogging for maximum productivity. Endura bond, a specialized high strength resin provides superior grit to backing bond for extreme durability. Recommended for use on leveling and heavy stock removal. For use on wood, metal and plastics. Includes five 3-7/8 In. x 5-1/2 In. assorted grits (80, 120, 220) mouse detail sanding sheets.