ESP Cards - Secretly Marked
Shhh! These cards are secretly marked on the back.
These cards have been designed at the Parapsychology Laboratory, Duke University, to test extrasensory perception.
Most mentalists choose this universally symbolized deck. There are five sets of five symbols for a total of 25 cards.
Comes in a poly bag with instructions on how to read the backs and a killer routine, "Pocket Prophecy."