Durahyde Nylon Pushball sized 48", contains the revolutionary Blad-A-Ball Bladder and is used inside Pushballs or Cageballs. Pushball is inflated and deflated through a valve that closes with a tight-fitting plug. Pushball activities are highly cooperative and gross motor in nature. Multi-colored "Durahyde" covers are visually exciting and sewn from contrasting panels of urethane-backed nylon, with leather-reinforced lace-up openings. Sold individually.