The mentalist displays four brass tubes, passes them out for examination and each spectator keeps one of the tubes for himself. They are unmarked and identical in every way. The performer then asks to borrow a $100.00 dollar bill (or any valuable or trinket that will fit in tube) and places the object inside the metal tube, caps it and hands it to one of the spectators. 

The performer then turns his back or leaves the room while the spectator collects the remaining tubes and mixes them up. The spectator is instructed to place each tube into the wooden tube holder onstage. On top of that, the spectator is instructed to cover each brass tube with a larger plastic cover. In other words, there is just no way the performer can possibly know which tube contains the treasure. However, somehow the performer does and instantly, he is able to come back into the room and divine which tube contains the valuable item.

Mastermind is completely self-working and comes complete with the custom made wooden tube holder base, four brass tubes, eight end caps, special gimmicks that make everything work, and four black plastic tubes that cover the brass tubes.