Features a flat plastic platform and 2 separate vinyl cylinders that shift more fluidly than other balance trainers, offering more stabilty to the user. Platform also features molded-in foam for increased safety and softness. Inflate/deflate cylinders separately to vary the difficulty. Supports up to 500 lb. Includes inflation pump and a 70-minute DVD (with three 20-minute workouts). 26"L x 26"W x 4'H; 20 lb.