The CanDo Core-Training Vestibular Dome offers a fast, effective workout by combining the effects of a vestibular board and an exercise ball. Use it to improve cardiovascular or aerobic fitness, muscular strength and endurance and flexibility while improving your overall balance. The CanDo Vestibular Dome is designed for use at every fitness level. You can start with easy exercises and gradually advance as you improve your balance skills. The air-filled dome can be inflated or deflated to adjust difficulty level. Dome and base are one continuous unit and measures 21 inches in diameter. Dome comes with pump and resistance tubing.