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By certification 
Description:
There are some invisible marks in every piece of the back of card. And you can see the marked cards clearly when wearing perspective glass.It's suitable for all kinds of poker games, for example,Blackjack,Omaha poker, Texas hold'em etc.
Use for:
Contact lens
Perspective glassess
poker cheat
gamble cheat
Other Modles:
Crient 714
Hoyle
Lancer
Opel
Rado
Paris
NO.772
There are some invisible marks in every piece of the back of card. And you can see the marked cards clearly when wearing perspective glass.It's suitable for all kinds of poker games, for example,Blackjack,Omaha poker, Texas hold'em etc.
Use for:
Contact lens
Perspective glassess
poker cheat
gamble cheat
Other Modles:
Crient 714
Hoyle
Lancer
Opel
Rado
Paris
NO.772
