Thera-Band Rocker BoardThe new Thera-Band Rocker Boards provide the balance and proprioception training for upper and lower extremities as yet another level in the Thera-Band System of Progressive Resistance. The Rocker Boards provide uni-directional challenge. Supplied in molded plastic, both products feature a sensory stimulation surface on the top, a lightweight product design, and an anti-skid surface on the bottom that resists slipping on smooth floors. Each product also comes with its own instruction guide with over 37 exercises.Dimensions: 14" x 14" x 3.5" tall