1、[Excellent Educational Scientific Tool] Demonstrates the pendulum, the law of conservation of momentum and the law of conservation of energy, and is an excellent educational scientific tool. 2、[Relieve Stress Toy] Pendulum ball is a very interesting relieve stress toy. The ball can be used to hit other balls and swing. 3、[Durable Material] Made of stainless steel and plastic material, which is durable, not easy to rust, and can be used for a long time. 4、[Gift For Kids] This pendulum ball with exquisite appearance, it is a perfect birthday gift and children's toy. 5、[Widely Application] Widely used for many situations, such as home, study and desk decoration, making your room more attractive. Item Type: Pendulum Ball Material: Stainless steel + plastic Product Size After Assembly: Approx. 26.8 x 16 x 23.5 cm / 10.6 x 6.3 x 9.3 in Features: Excellent educational scientific tools, showing the pendulum, the law of conservation of momentum and the law of conservation of energy Weight: Approx. 476g / 16.8oz 1 x Pendulum Ball 1 x Base