Item Type: Perpetual Motion Machine Desk ToyProduct Material: Plastic, Stainless SteelBattery: Polymer lithium battery 2000mah (shipped with built in battery)Weight: Approx. 700 g / 24.7 oz .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; } 1Perpetual Motion: The perpetual motion machine has simple shape, unique and complex design, which can keep the ball rolling all the time, and can be used as a toy or decoration. 2ABS, Stainless Steel Material: The perpetual motion machine is made of premium ABS material, and the wire is made of stainless steel, which is colorful and durable. 3Educational Toy: This perpetual machine toy is very suitable for children to enjoy the charm of scientific physics, improve their ability to explore the mysteries of science, and bring them great happiness and curiosity. 4Easy Using: The toy operates with no noise, it can work for 4 to 5 hours after 1 charge. Touch switch is convenient for your use. 5Gifts for People: This interesting toy is an ideal gift for your friends, family and colleagues. Very tasteful gift