Features of the Cando Vestibular Disc: Use the heavy-duty Cando balance board to strengthen and condition lower body. Perfect for vestibular training. Improve ankle ROM, balance, body awareness, and develop joint mobility and reaction skills. Durable, heavy-duty and non-skid. Lightweight, compact for portability. The product referenced on this detail page is sold be Each. 24 inch diameter, Yellow. The inflatable vestibular disc mimics both the movement and shape of the inflatable ball when used on any seat. It acts as a dynamic cushion to activate major muscle groups. Use it on the floor as a standing disc for balance training, proprioception, and strengthening of the lower extremities. Can be deflated to 1" thickness (mushy) or inflated to 2" thickness (firm). Each disc has one nubby side for tactile feedback and stimulation, and one flat side. Also available in 14" diameter.