Features:This item is a screw props for magic performing. It contains the gimmicks and batteries inside.Magician first demonstrates a bolt and a nut to audiences. Then he randomly choose one of them, and asks the person to fasten the nut onto the bolt a few rounds. Ultra energy is applied to the bolt, obviously you'll see the nut began to spin up, until it completely unscrew to come off the bolt. The magician passes the separate pieces to the audience for inspection. They look just like any ordinary bolt and nut. You can perform the trick in any condition without practicing any skills.The magic toy for both kids and adults, satisfy your curiosity.Specification:Material: MetalColor: As picture shownSuitable for kids under 14 years oldBattery: 2 x Button Battery (Batteries included)Length: Approx. 5 cm/ 1.97 inchPacking List:1 x Bolt1 x Nut2 x Battery1 x Magnet1 x Glue