Spy Cheating Playing Cards

Wea re offering spy cheating playing cards,
the marked cards can use in the poker game, and help the user to win in the gamble. With the help of spcial contact lenses or the prospective glasses, the user can see what is the number and suit before they get, of course, other players can not see anything. There are some marks in every piece of the back of playing cards card. You can know the playing cards by identify the marks.
specification :
luminous invisible cheting playing card is for contact lenses.
High quality luminous marked cheating playing cards.
Marked cards can be used as long as one year.
High quality marked cards can be seen under various light while can not see the marks with naked eyes.
Big mark in the middle and small marks on four corner are available.
Marks can be also customized.