Frame-A-Coin double pocket flips provide the highest quality and clarity for processing and storing coins. Frame-A-Coin's UN line of flips is made from unplasticized vinyl without the harmful softners found in traditional soft vinyl flips. As a result, they are more rigid but safer. The 2.25x3.25 size are the size typically used by auction houses for auction lot viewing of uncertified coins. Sold in packs of 100 flips without inserts.