Diablo DCS045040S06G 4-1/2 in. x 5-1/2 in. 40-Grit Ultra Coarse Palm Sander Sheet (6-Pack) 4-1/2-inch by 5-1/2-inch 40-grit paper Premium aluminum oxide blend - a superior quality formulation designed for fast material removal and long sanding life Clog-SHIELD, a 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