5-inch disc; (3) 80-grit, (2) 150-grit and (2) 220-grit; premium ceramic blend, a superior quality formulation designedfor fast material removal and long sanding life; unique 12-hole pattern provides a one-size-fits-all design (fits all 5and 8-hole sanders) for fast and precise alignment; premium Hook and Lock backing enables repeated attachment and removal of discs for a consistent secure connection.