The large Tai-Chi Board alone is a balance board. Teamwork and coordination are developed while two children stand on it at the same time and work together to rotate the ball along the orbit. The two interchangeable disks can be added for more fun and to present a challenge. The two disks can also be used as a handheld device for one or two people to enhance hand-eye coordination. Up to 6 children can use the balance board and two disks at one time! Includes 3 balls.