Freud DCTCAT120H05G Detail Cat/Mouse Hook and Lock, 3-7/8" x 5-1/2" 3-7/8-inch by 5-1/2-inch 120-grit paper 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