1. Introduce your kids to the joy of mechanics with this desktop decoration. It has galvanized steel balls and a plastic base for durability. It is suitable for psychology, teaching aids and creating a calm atmosphere. It can be 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: The Newton's Cradle Balance Ball is a desktop decoration that provides entertainment and educational value. This device with galvanized steel balls and a plastic base is designed to let children experience the joy of mechanics while playing. The oscillations of the balance ball can help keep one calm, making it suitable for psychology, teaching aids and as a decorative element in various places 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 choice as a birthday or holiday gift for those who like 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. Size details: - 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