Mini Newton's Cradle Toy Balance Ball Toy The product is shipped based on the color or size of the main image of the product page. About this product: GREAT EDUCATIONAL SCIENCE GADGETNot only shows a pendulum, but also shows the laws of conservation of momentum and energy. Teach your own science story and explore the meaningful values of physics. HELPS REDUCE STRESSScience toy. When you are tired of studying and working, you can shuffle balls to hear the rattling sound. PRINCIPLE SWINGPull back one or more balancing balls, release them and the same number of balls will swing to the opposite side. NEWTON'S CRADLE BRINGS MORE THINKINGFriction and damping effects are also observed, you will have more opinion for your problem when you look at this mini balance ball. SATISFACTION GUARANTEEDWe care about all customer feelings. If this product does not meet or exceed your expectations, please return it for a 100% refund, no questions asked. Product Description: Description: This movement toy is made of stainless steel material, anti-rust, safe and smooth to the touch. Great for home ornament, study or office desk table decor accessories, etc. also good for birthday gift and kids toy. Specification: Condition: 100% brand new. Material: stainless steel. Colour: Sliver. Size: 18 x 11 cm / 7.09 x 4.33 inch (approx.). Package Included: 1 movement set. Note: 1. Please allow 1-2cm error due to manual measurement and make sure you do not mind before ordering. 2. Please understand that colors may exist chromatic aberration as the different placement of pictures.