Fun and easy to build toy for kids. Science is fun. Go nuts. Neodymium Magnets are required along with a regular AA battery, and some copper wire. Tap a little dent into battery so wire stays in place. Caution wire gets hot, don’t leave unattended. Neodymium magnets are so strong they can be dangerous. Don’t let them clack together or they might break into bits. Eye protection would be good. Don’t swallow magnets~ (watch the little ones)… More at JEMTOY.