Rocking on board stimulates balance control and vestibular responses. Wooden boards are covered with carpeting which has non-slip surface. Used for reclining, kneeling, sitting or standing. Oversize 30 x 60 x 12 inch rocker board moves side-to-side, front-to-back and combination(both side-to-side and front-to-back) whereas Standard size 18 x 18 x 5 inch rocker board moves combination(both side-to-side and front-to-back).