CanDo Ball Chair - Plastic - Mobile - with Back - Child Size - with 15" BallCanDo Ball Chair Plastic Mobile with Back Child Size with 15" Ball CanDo plastic ball chair includes a 15"(38 cm) inflatable exercise ball and chair base. The mobile ergonomic seating systems combine the benefits of ball therapy with the convenience of a chair base. Ball held securely in place by the base. Casters glide on carpet or hard surfaces. Light assembly required. The plastic ball chair is available in child and adult size. Locking casters