Item Type: Balance Pendulum BallMaterial: Iron, BirchProduct Size: Approx. 14 x 13.5 x 11.5cm / 5.51 x 5.31 x 4.53inPackage List1 x Balance Pendulum Ball1.The manual measurement may have 0&8209;1cm error. Make sure you don't mind before ordering. 2. Due to the difference between monitors, the picture may not reflect the actual colour of the item. 1Stress Relieving Ornament: A charming desk ornament. Not only does it add beauty to a room, but it also relieves stress while you're playing. This is a cool and fun game for office workers to avoid anxiety. 2Fun Playing: Five balls hanging side by side, and they are in contact with each other and the centre of the ball is on the same line. First, pull the ball on the left 15 to 20MM away, then let it go. The ball swings up, and it swings about the same distance as the ball on the left is pulled apart. 3More Fun for Your: If the two balls on the left are pulled apart at the same time, after the collision, the two balls also stop, and the two balls on the right swing. When the ball on the right swings back and collides with the ball on the left, it will again Gives momentum to the ball on the left. 4Educate with Play: Also the perfect schooling gadget. It can guide children to understand the meaning of energy conservation. Let children accept the baptism of science while playing. 5Ideal Gift: The classic design makes it a great gift for kids, family, friends and colleagues, or as a decorative touch on a desk or a coffee table at home so they can relieve stress when they need it while keeping kids entertained.