These plastic coated cards are all individually and subtly marked on the back so you can tell which card is which. You would never notice that they were marked unless shown though. Amaze your friends by guessing their card with this discretely marked deck of cards. The backs of the cards are all identical so that they can be used to play poker and other card games. Pack comes complete with instructions that show you how to use this deck. They are good quality cards that will give you years of service.