Description Features of the Thera-Band Rocker Board:Designed to facilitate balance and proprioceptive training, and automatic postural reactions.Allows for one plane of stability at a time.Constructed of black molded plastic with a specially designed tactile surface on the top, and an anti-skid surface on the bottom.Comes with an illustrated instruction guide with over 37 exercises.For use in ankle and knee injury prevention and strengthening, core strengthening and stability, and sensorimotor training.300 lb. weight limit.