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Tricks of invisible ink pen contact lenses

Invisible ink pen contact lenses are specially designed for reading marked cards in person.
Most poker players like to mark playing cards with invisible ink by self, but how to check marks whether is correct or not remain a question. Here there has invisible ink pen contact lenses for sale to you, and you can use after marking poke cards.
There have many kinds of playing cards cheating devices in poker fields, invisible ink pen contact lenses are one kind of it.