SpecificationNunn PendulumCraftsmanship: electroplatingStyle: modern artBatteries: powered by 4 batteries (this product does not include batteries)Material: plasticPacking list. 1 x Newton pendulum ball (product does not include batteries)Features.1. 100% new and high quality2. Can be placed on a table or a shelf, it will be a bright sight in your home or office.3. After installing the 4 batteries, move it gently and it will keep on wobbling4. Whether you put it in your home, living room, study or desk, it is a bright sight and a creative decorative design. Not only does it showcase the pendulum, but also the law of conservation of momentum and energy.5. A special gift for Christmas, birthdays, Children's Day, Thanksgiving and other holidays.Cautions.1. Due to manual measurement, please allow 1-2cm error. Thank you for your understanding.2. Due to different lighting and screen settings, the colour of the item may be slightly different from the picture.