Enjoy some serious fun in camps, gym class, or even your backyard with Champion Sports Rhino Ultra-Lite Cage Ball Sets. The multi-colored cover is constructed from a durable, 100% nylon double-stitched shell that can withstand even the most energetic play. It features an extra-wide, concealed Velcro® zipper for hassle-free bladder insertion. The included bladder boasts superior performance with exceptional air retention and incredibly fast inflation/deflation thanks to its extra-large valve. Fifty percent lighter than traditional cage balls, this set is perfect for players of all ages and skill levels. Replacement bladders and covers are also available sold separatelty in 24"D, 36"D, 48"D, 60" and 72"D ensuring lasting fun.