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Do away with your PK Rings! This is an electronic accessory that you could work into any effect where the use of magnets are employed. The detection range is dependant upon the size of magnet you are using. It is a silent vibration unit. It can be worn comfortably under your clothing. The creative person will find many uses for this. The spectator is given a ball to hide in one of their hands. Using his mental powers the performer is able to reveal which hand contains the ball. You can play in anywhere, anytime. Complete set includes: Magnet ball+ Magnetic Detector