Russia 9817 marked cards have 36 pieces of cards, which are the same as ZGY marked cards. They are soft and printed by special invisible inks. Most Russians like using them to cheat at Russian games. It is good for you to wear IR contacts or sunglasses to see marks on the back. You can buy these marked cards directly from us. But if you want to send your cards for processing by us, we can do it as well. Welcome to have a consultation!