Piatnik OPTI Jumbo Index Marked Cards

Piatnik OPTI bridge size large index poker marked cards are the cards marked with invisible ink on the back, and those marks are luminous only when wearing our infrared contact lenses. To work perfectly, don’t forget to buy our infrared contact lenses at the same time, for invisible marks we made on Piatnik OPTI bridge size large index poker can’t be seen by naked eyes or other contact lenses. 

How to see invisible ink marks of Piatnik OPTI marked decks? The IR contact lenses is ideal!