[Gravity At Work]See before your eyes as the Cradle transfer fall and transfer weight across the gadget. Drop one ball or two balls. You can see the energy transfer in such an astounding way[Office Desk Decor] Balls Show some character and your love for science and physics with this decorating your office space. Can be meditative and to watch also[Educational & Classy]Balance Swinging Experience the visual display of momentum. Use this in class and share with your friends and family the exciting world of physics and science[Quality Materials]'s Cradle is made High-grade mirror stainless steel, hand-polished, soft and color, comfortable touch, firm structure, durable and rust-free.size:180 x 110 x 185mmMaterial:metalcolour:SilverPackage Contents:1 x CradleOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.