Integrated polyurethane forms the striking ball here, a dense one-piece skin that takes repeated impact without splitting at the seams. Behind it a high-tension spring snaps the ball back to center after every shot, so combinations flow instead of stalling. Four locking heights of 55 in, 57.5 in, 59 in and 62 in cover users of different sizes. The 19 in base takes 28 L of water or 70.5 lbs of sand for ballast and grips the floor through six suction cups, holding steady on lawn, wood, tile or carpet. The ball itself measures 7 in across. Empty weight is 11 lbs, and a pair of red boxing gloves is supplied so that training can begin straight away without a second purchase.