Abilitations Integrations 13-1/2 inch Ball Chair with Storage Leg is an ideal classroom tool that is perfect for children with SI, ADD, low tone or processing disorders. Ball chair made of anti-burst material has 4 built-in legs to eliminate roll-away. Colorful ball chair great for children and adults stands for burst resistance quality. Users work on aerobic exercises, stretching, strengthening, relaxation and can be used by students just sitting at their desks working. It helps to develop balance, rhythm, coordination, postural control, sensory integration and fitness.