The Fargo 82267 cards themselves are 10mil thick and feature an adhesive back and Mylar backing over the adhesive. Before the backing is removed, they are 24 mil thick. Using a Mylar backing on the card makes the card slightly thicker then paper backed cards before the backing is removed. Mylar backed cards are a great option for those looking for 10mil adhesive cards, but whose printers require a thicker card then normal paper backed adhesive cards.