Educational ToyAn excellent educational science tool shows the swing, but also the law of conservation of momentum and energy. Owning scientific history and exploring the important value of physics, suitable for birthday gift and childrens toy. .Relieve Your StressAs office desk decoration, when you are tired of studying and working, you can stir the ball to see the swing ball and hear the jingling sound to reduce stress. .Desk DecorationInteresting and suitable for decoration, perfect for home decoration, study or office table decoration accessories. Pull one or more balls backwards, release them, and the same number of balls will swing on the other side. .High Quality MaterialThis Cradle Balance Balls is made of high quality metal material, sturdy and durable to use and and the unique design idea make impressions. .Perfect as A GiftThis Cradle Balance Balls can widely used for home / office desk decoration or birthday gift. And suitable for children to experience the fun of mechanics in the process of playing this fun gadget. .