Condition: 100% Brand New Item Type: Balance Balls Material: Plastic + Steel Ball Color: As Pictures Shown Size: Approx.17.8 x 14.8 x 18cm / 7 x 5.8 x 7.1in 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 Base 1 x Bracket 1Excellent educational science tool, showing the pendulum, the law of conservation of momentum and the law of conservation of energy. 2This is a very interesting decompression toy. The ball can be used to hit other balls and swing. 3Made of high& 8209;grade plastic and sturdy steel balls, durable and reliable, you can use it for a long time. 4Suitable for home decoration, study room and desk decoration, because it looks beautiful and fashionable. 5It is also a perfect birthday gift and children's toy, your friends and kids would love it.