The pendulum ball, innovative fun toys suitable for home decoration, study and desk decoration. This is a very interesting decompression toy. The ball can be used to hit other balls and swing to help you release stress. The multipurpose bumper ball is not only a decompression toy, but also a perfect birthday gift and children's toy. Excellent educational science tool, showing the pendulum, the law of conservation of momentum and the law of conservation of energy. Durable, made of high grade plastic and strong steel balls, with a long service life, and can be used for a long time. Feature: 1. Excellent educational science tool, showing the pendulum, the law of conservation of momentum and the law of conservation of energy. 2. This is a very interesting decompression toy. The ball can be used to hit other balls and swing to help you release stress. 3. Durable, made of high grade plastic and strong steel balls, with a long service life, and can be used for a long time. 4. The pendulum ball, innovative fun toys suitable for home decoration, study and desk decoration. 5. The multipurpose bumper ball is not only a decompression toy, but also a perfect birthday gift and children's toy. Specification: Item Type: Pendulum Ball Material: Plastic+Steel Ball Weight: Approx. 232g / 8.2oz Assembled Product Size: Approx. 13.5x11.5x14cm / 5.3x4.5x5.5in Purpose: bumper ball pool chaosing pendulum Features: Excellent educational scientific tools, showing the pendulum, the law of conservation of momentum and the law of conservation of energy Package List: 1 x Pendulum Ball 1 x Base Note: 1. Please allow 12cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.