①. Introduce your kids to the joy of mechanics with this desktop decoration. Galvanized steel balls and plastic base for durability. It is suitable for psychology, teaching aids and creating a calm atmosphere. It is an ideal birthday and holiday gift for those who appreciate unique decoration. It is suitable for any space - home, dining room, bedroom, cafe or office. ②. Description: Introducing the Newton's Cradle Balance Ball, a desktop decoration that provides entertainment and educational value. This device with galvanized steel balls and plastic base is designed to introduce children to the joy of mechanics while they play. The oscillations of the balance ball can help keep you calm, making it suitable for psychology, teaching aids and as a decorative element in various rooms like the house, dining room, bedroom, cafe or office. Although air resistance and friction may limit the balance ball's movement time to 15 - 25 seconds, its design makes it a good birthday or holiday gift for those who appreciate unique and educational decor. Add charm to your space with this Newton's Cradle Balance Ball! ③. Product Name: Desk Table Decoration. ④. Material: Plastic, Metal. ⑤. Surface Process: Electroplating. ⑥. Style: New Chinese Style. ⑦. Features: Stress Reliever, Square Design, Kinetic Energy. ⑧. Sizes: - Black 3, Length: 17.5 cm / 6.89", W: 14.7 cm / 5.79", H: 18 cm / 7.09" (approx.) - Red 2, Length: 14 cm / 5.51", W: 11.5 cm / 4.53", H: 14.5 cm / 5.71" (approx.) - Black 2, Length: 14 cm / 5.51", W: 11.5 cm / 4.53", H: 14.5 cm / 5.71" (approx.) - Red, Length: 9 cm / 3.54", W: 7 cm / 2.76", H: 9 cm / 3.54" (approx.) - Black, L: 9 cm / 3.54", W: 7 cm / 2.76", H: 9 cm / 3.54" (approx.) ⑨. Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. ⑩. Package Includes: 1 x Desktop Decoration