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Spy invisible playing cards contact lenses

What are marked cards contact lenses? Marked cards contact lenses are just the same as regular contact lenses. When you look at them, there is no difference on the surface. Therefore, you do not know whether others using luminous ink contact lenses and marked cards.
All kinds of marked playing cards are able to be seen by spy invisible playing cards contact lenses. There is no need to worry about being found by others. We have different kinds of marked cards contact lenses according to different eyes color.
Marked cards and luminous ink contact lenses are secret playing cards tricks to win in poker games.