Almost all the cheating devices need be supported by marked cards. Without marked cards, the devices can not work. Such as for contact lenses, if cards not been marked, also can not see anything.
Marked cards, also called invisible ink marked cards, is the mark printed on the back of cards, not be seen by naked eyes. There are many kinds of marked cards. Different contact lenses, need different marked cards.
Our company can mark all kinds of cards for you, such as Copag, KEM, BEE, Bicycle and many cards all over the world. Also, we can do the marks according to your design.
How long can the marks keep on the cards?
We use the best ink to mark the cards, all our marked cards can be used for more than 1 month.