The magician has a spectator examine a pair of ungimmicked double-locked thumb cuffs. The spectator is then locked into the thumb cuffs and is unable to escape. The magician shows that only 2 keys can open the cuffs and free the spectator. The magician gives both keys to another spectator to hold. The magician's thumb cuffs are locked on by a volunteer. The spectator covers the magician's hand with a cloth (not included). Instantly the magician has escaped! Wait...he's in again...no, he's out! Finally, when the cloth is whisked away, the cuffs have completely vanished!!!
These are real ungimmicked thumb cuffs, and 2 keys, they come complete with the above routine.