Travel ESP Cards Black (Gimmicks and Online Instructions) by Paul Carnazzo - TrickZener cards, also known as ESP Cards, are a great tool for Mentalists and Magicians. By using ESP Cards (shapes include wavy lines, a circle, a square, a triangle, and a star) instead of standard playing cards, spectators perceive that you're tapping into their mind even more! Travel ESP Cards is the most portable deck of Zener cards ever made! The cards are 100% plastic, they are the same dimensions as a credit card, but are SUPER thin. These cards