The perpetual motion ornament is perfect, Sizes: 10.43in(H) base (H):4.25 in and NW: 0.77Ib .powered by 4PC AA batteries (Battery not included). It has a wide range of application such as great gift for science project, as a Christmas gift, Physical/mechanical balance learning. Provides many benefits and entertainments, it is suitable for various locations such as house,class or office, show the laws of conservation of magnet and physics. Simply assemble and install the battery,gently move the middle part with your hand, and it will swing happily. until the energy supply stops. Get relief from daily life stresses and anxieties. The electronic magnetic endless motion toy with its spinning and oscillating, swinging back and forward movements will release your stress. WELL MADE----Most of material are silver stainsteel and PVC plastic,chromium plating process, the functional mainly reflects in wear-resisting, has a smooth surface, will not rusty and fade.