Specifications: Not only demonstrates a pendulum, but also shows the laws of conservation of momentum and energy. Includes steel balls, plastic frames and base. Often used as a toy. Type: Cradle Ball Shape: Geometric Material: Metal, ABS Occasions: Office, Home, Table Desk Features: Funny, Creative, Room Decor, Desk Ornaments Size: 9cm x 7.5cm x 9.5cm/3.54" x 2.95" x 3.74", Ball Diameter: 1cm/0.39" (Approx.) 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. Package Includes: 1 x Cradle Ball Desk Toy