These pre-treated 2 inch squares are great for polishing or removing oxidation. Pads are tight-bond cellular foam with permanently bonded micro-abrasives. I love these babies. I go through 5-10 of them a week. You can use these pads until they are dark grey on both sides and then it is time to toss it and use a new one. Make sure the piece you are polishing is completely dry. If you get these pads wet, they get gooey and weird.