Feature: 1. Gravity Effect: You can see the process of dropping and transferring weight by throwing a ball or two, and you can see the energy transfer in such an amazing way. 2. Stress Relief: Physics pendulum balls is a stress relief gadget that allows you to take a break from the exhaustion of life and do relax yourself. Suitable for children with ADHD or autism. 3. Educational Tool: The pendulum ball demonstrates the conservation of momentum and energy and can be the perfect school education gadget to teach students about the meaning of energy conservation in the classroom. 4. Multipurpose: Pendulum balls is not only a toy, but also a good desktop decoration, you can put it on your table or shelf. 5. Ideal Gift: A swinging balance ball can also be the perfect gift for family, children and friends at school, home, office, etc. Specification: Item Type: Swinging Balance Pendulum Material: Plastic, Metal Product Specification: 1 Set Product Use: Household Scope of Application: Most Scenes Size: Approx. 9 x 8.5 x 7cm / 3.54 x 3.35 x 2.76in. Package List: 1 x Base1 x Pendulum Ball Assembly