Features: 1.When the Newton ball transfers down and transfers weight on the gadget, you can see the energy transfer in an amazing way. 2.Decorate your office space with this to show some personality and express your love for science and physics. 3.Use high quality nylon line instead of cheap fishing line, plastic base and unique design concept impress people. 4.Made of metal material, newtons cradle has a bright appearance. Putting it on the table can make you feel comfortable. 5.A great gift, you can send this balance pendulum to your friends who like physical and science. specification:Item Type: Newtons Cradle Material: Plasticandmetal Size After Medium White Combination: Approx.13.5 x 11.5 x 13.5cm or 5.3 x 4.5 x 5.3in (manual Measurement, There is a Small Error) Size After Large White Combination: Approx.17 x 14.5 x 18cm or 6.7 x 5.7 x 7.1in(Manual Measurement, There is a Small Error) Product Use: Suitable for Desktop Decorations, Gifts, Etc. PackageList:1 x Pedestal 1 xSwing Ball