A 21” diameter crystal clear vinyl ball with 12 bouncing balls in vibrant colors inside, Activity Ball is latex, BPA, and phthalate-free. The balls moving inside the ball promote visual tracking, auditory discrimination, and experimentation as sounds change with the motion of the ball. Develops spatial orientation, coordination, motor, and social skills. Activity Ball is a must have for the visually impaired. Strong enough to use for exercise and as a therapy ball, recommended maximum body weight is 270 pounds. Manufacturer cautions against using weights when exercising with Activity Ball. Ships flat, ready to be inflated with a foot pump, sold separately.