Travel ESP Cards (Online Instructions) by Paul Carnazzo
Zener 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 appear to be from the same Institute of Parapsychology as some of the other Mental Voyage Testing Cards. 

You'll keep these cards in your wallet and be ready for a Zener test everywhere you go! Included with the cards are routines by Paul Carnazzo, Ran Pink and Pablo Amira. The Travel ESP Cards comes with a PDF instruction manual.