Age range:Kid Batteries included?:No Specification: Condition: 100% brand newMaterial: Glass + fishing line + plastic baseColor: As pictures shown Battery: 4 x AA batteries(not included)Size: approx. 12 x 9 x 12cm / 4.72 x 3.54 x 4.72inchPackage Weight: approx. 185g Package Included:1 x Balance Balls Toy Note:1. Please allow 1-2 cm 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.3. Please note that the color of the base will be sent randomly, and make sure you will not mind before ordering. Commitment:Our aim is to provide high quality products. After you buy our products, I will ship them to you as soon as possible, so that you can receive the products as soon as possible. If you have any dissatisfaction after receiving our products, please contact me in time, I will reply all your questions within 24 hours, I will solve all your problems, I will give you a refund or replace the goods. We are committed to providing our customers with a great shopping experience. [Colorful Pendulum Balls]---Glowing Newton ball swing more dazzling at night, the base has a luminous plate, projected onto the glass beads, glass beads showing colorful, very attractive.Elegant decor and stylish design make it a great desk decoration for your bedroom or office.Fitted with 4*AA batteries (NOT include). [Newton's Laws of Motion]---This Newton's cradle balance ball toy is a good practice of physics in action demonstrates the principles of kinetic energy and conservation of momentum. Pull one or more of the balls, release them and the same number of balls will swing on the other side.Pendulum balls are able to continue in perpetual motion for approximately 20-30 seconds dependant on the resistance induced by air and friction. [Educational Science Gadget]---Not only demonstrates a pendulum, but also shows the laws about conservation of momentum and energy. Perfect educational toy to embrace the story and the mystery of science.It an make people concentrate and then gradually relax, are great for psychology, science and physics classrooms.By playing this newtons cradle balls, explore significant values of physics, inspire us to better learn and understand the Newton's laws of motion. [How To Play]---Pull back one or more of the balance balls, release them and the same number of balls will swing up on the opposite side.Usually, when under normal circumstances, because different force and environment, the swing time will be different. The balance balls continue in perpetual motion for only 15 seconds due to the resistance of the air and friction. [Perfect Gift]---Suitable for psychology, teaching tools and furnishings, a nice gift for your kid, let them experience the fun of mechanics in the process of playing this fun gadget.Very suitable as a gift for friends or relatives. Especially on important days such as Christmas, Valentine's Day and Children's Day. [Colorful Pendulum Balls]---Glowing Newton ball swing more dazzling at night, the base has a luminous plate, projected onto the glass beads, glass beads showing colorful, very attractive.Elegant decor and stylish design make it a great desk decoration for your bedroom or office.Fitted with 4*AA batteries (NOT include). [Newton's Laws of Motion]---This Newton's cradle balance ball toy is a good practice of physics in action demonstrates the principles of kinetic energy and conservation of momentum. Pull one or more of the balls, release them and the same number of balls will swing on the other side.Pendulum balls are able to continue in perpetual motion for approximately 20-30 seconds dependant on the resistance induced by air and friction. [Educational Science Gadget]---Not only demonstrates a pendulum, but also shows the laws about conservation of momentum and energy. Perfect educational toy to embrace the story and the mystery of science.It an make people concentrate and then gradually relax, are great for psychology, science and physics classrooms.By playing this newtons cradle balls, explore significant values of physics, inspire us to better learn and understand the Newton's laws of motion. [How To Play]---Pull back one or more of the balance balls, release them and the same number of balls will swing up on the opposite side.Usually, when under normal circumstances, because different force and environment, the swing time will be different. The balance balls continue in perpetual motion for only 15 seconds due to the resistance of the air and friction. [Perfect Gift]---Suitable for psychology, teaching tools and furnishings, a nice gift for your kid, let them experience the fun of mechanics in the process of playing this fun gadget.Very suitable as a gift for friends or relatives. Especially on important days such as Christmas, Valentine's Day and Children's Day.