Dramatically demonstrate the power of induction by hurling an alminum ring up to 12 feet! Our affordable coil gun use line voltage to generate current sufficient enough to move objects while employing a special miscroprocessor to keep the current in check. Includes solid and split aluminum rings: acrylic ring; microprocessor; extendable shaft for safety (prevents seated students from leaing over the device); speical rubber rim that absorbs impact; insulated electrical components; Instructions included.