4" Economical wet diamond polishing pad set with black buff (8 pcs) for granite and concrete 8 pieces including: 50#, 100$, 200$, 400$, 800$, 1500$, 3000$ and black buff Color coded hook and loop backing Wet use (with water) only This economical resin-bonded diamond polishing pad set includes 8 pieces 4 inch pads from coarse to fine: 50#, 100#, 200#, 400#, 800#, 1500#, 3000# and black buff. They can be used for granite, marble, concrete and other stones. Specifications: 4" diameter; Wet use only ; Color coded hook and loop backing.