A favorite used with a variety of oxide polishes for finishing a range of gemstones. The Raytech Tin Lap has a heavy layer of pure rolled tin laminated to a Raytech Master Lap and turned true. The Crystalite tin lap is a fine grained rolled tin lap bonded to a Master Lap, producing an excellent final polishing lap. This lap will not develop orange peel and scoring is not required. Can be used with Crystalite A, Cerium Oxide, Tin Oxide, or diamond.