Description: Gravity At Work: See before your eyes as the Balls transfer fall and transfer weight across the gadget. Drop a ball or two balls. You can transfer in such an astounding way! Office Desk Decor: Show some character and express your love and physics with Newton's Cradle Balance Pendulum decorating your office space. Can be meditative and fun to watch also! Educational & Classy: Experience the visual display of momentum. Use Newton's Cradle Balance Balls in class and share with your friends and family the exciting world of physics and science! Quality Materials: Newton's Cradle is made of durable frosted glass, fishing line and plastic base, and it will light up on the baseboard, and the balls will look colorful and beautiful, very attractive. Newtons Balls Edutainment: Physics Learning Desk Toy Suitable for children to experience the fun of mechanics in the process of playing this fun gadget also a perfect decoration for desks and tables, whether at the office or at home. Size Chart: 12cmx9cmx12cm/4.72inchx3.54inchx4.72inch Package Includes: 1newton's cradle pendulum Note: Please allow slightly errors due to manual measurement and different monitors.