XF contact lenses for marked cards cheating in the card games

Description:
XF contact lenses are manufactured for backside marked cards, you can see the invisible ink freely by it. The diameters of color part is 6mm, so it is hardly to be found by others, what's more, it can see the marked cards more clearly than the big size.
Size: 6mm of color part
working hours each time: about 8 hours
Optional Accessories:
1.Luminous poker playing cards
2.Marked rummy cards
3.Marked Chinese Majong
Advantage:
1.More hidden than poker glasses
2.The easiest way to cheat in poker game
3.High quality to see marked cards very clearly
4.Can use for all kinds of poker game
Tips for using the perspective contact lenses:
1. The best suitable situation is under the white light, especially the energy-saving light.
2. Please make sure to wash your hands clearly before wear the perspective invisible glasses in case of infecting your eyes.
3. Before playing the poker games with perspective invisible glasses,
the user who is not a myopia had better wear the glasses about several hours for adapting