This is a Grit Kit for a 16" Mirror. It contains the Grit and Pitch needed to grind and polish a mirror. It contains SiC #80 2 LB, #120 1 1/2 LB, #220 1 LB, #320 1/2 LB, WAO 25 Micron 1 LB, 15 1/2 LB, 9 1/2 LB, 5 1/2 LB, CEO 1 1/2 LB and Gugolz Pitch 3 LB.