Feature: 1. Due to air resistance and friction, the toy only lasts for 2‑3 minutes of perpetual motion, and the swing slows down as time goes by, and finally stops 2. Will be in a balanced state, just like a tumbler, as a very interesting toy, the desk toy can show a lot of unexpected movement states 3. For children who want to learn more about the laws of conservation of physics, the desk toy is an useful device that can provide benefits and entertainment 4. A great desktop decoration and gift, for family or friends, and can also be used for teaching, very easy to install 5. Suitable for various places such as home or office, not only can show the pendulum movement, but also help to learn the conservation laws in physics Specification: Item Type: Perpetual Motion Desk Toy Product Material: Aluminum + Iron Diameter of Bottom Circle: Approx. 5.8cm/2.3in Support Height: Approx. 12cm/4.7in Bracket Width: Approx. 3cm/1.2in Product Use: Suitable for Desktop Decoration Gifts. Package List: 1 x Perpetual Motion Desk Toy 1 x Base frame