The WePlay Tai-Chi ball is designed for children to increase coordination, posture and concentration. Involves twisting and turning one's body and encourages hand-eye coordination. Strengthens the flexibility of wrist and promotes good posture for writing. Promotes self-confidence and enhances the ability of reaction and concentration. Improves balance in movement. Ages 4 and up. SIZE: 8 inches. COLOR: Clear with green track pathway and yellow ball inside.