Modern Movement M-Board 1.1 Dynamic Balance Trainer, Dark Gray/Green Harder ball designed to support up to 350 lb. user; Ends of Deck have non-marking bumpers Patented design provides more 3-dimensional movement than other balance trainers Patented design provides more 3-dimensional movement than other balance trainers Harder ball designed to support up to 350 lb. user; Ends of Deck have non-marking bumpers Patented design provides more 3-dimensional movement than other balance trainers Workout poster and DVD included