Freud DCVDRMVGPS10G Sanding Sleeves 9-inch by 11-inch (5) 80-grit, (5) 150-grit Premium Zirconium 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