Mfgr. #23323 * X-Soft Black * 17.25 x 10.125 x 2. Shipping Carton Size: 16 L x 14 W x 4 H *Theraband© Stability Trainer is used to improve motor skills and balance particularly among the elderly and for knee back and ankle rehab * Two foam pads of different densities and one air filled cushion allow users to work through progressive levels by standing on a pad * The green Stability Trainer is firm and provides a beginning level of challenge * The blue Stability Trainer is soft and introduces an increased level of challenge to the user * For maximum challenge use the new extra soft black Stability Trainer. It is air filled to provide multiple direction displacement * One side offers rounded points for sensorimotor stimulation and its heavy gauge side walls resist the tendancy to roll the ankle during exercise