similar to sandpaper, but easier to use. Must use wet to avoid trailing marks. If using diamonds, you go to the same grit as the pad grit, then down with the pad. So they say M1, M2 etc. it's 800, 1500 & 3000 then Lux. I go to 800 resin, then down with the 800 pad, or M1. The pads leave less of a shine then diamonds, but it looks better if you go up with diamonds, then down with the pad, as opposed to trying to progress to the next step with the pads. 400 diamonds then 800 pad won't leave as nice of a finish.