This is a Grit Kit for a 10" Mirror. It contains the Grit and Pitch needed to grind and polish a mirror. It contains SiC #80 1 LB, #120 3/4 LB, #220 3/4 LB, WAO 25 Micron 1/2 LB, 15 1/4 LB, 9 1/4 LB, CEO 3/4 and Gugolz Pitch 2 LB.