Feature: 1. Stress Relief: This balance ball can not only add beauty to the room, but also relieve your stress, suitable for office workers to reduce anxiety. 2. Educational: This pendulum ball is an excellent educational science tool that demonstrates the laws of conservation of momentum and energy. 3. Ideal Gift: The classic design makes it a great gift for kids, family, friends, and colleagues so they can relieve stress when they need it, while keeping kids interested. 4. Beautiful Decoration: This pendulum ball can not only be played, but also can be placed on the table or coffee table for decorative effect. 5. Acrylic and Iron Material: This pendulum ball is made of iron and the stand is acrylic, which is very strong and durable. Specification: Item Type: Balance Pendulum Ball Material: Acrylic,iron Size: Approx. 16 x 11.5 x 8.5cm / 6.3 x 3.3 x 4.5in. Package List: 1 x Balance Pendulum Ball Note: 1. Manual measurement may have 0‑1cm error. Make sure you don't mind before ordering.2. Due to the difference of different monitors, the picture may not reflect the actual color of the item. Thanks!