The Official ball of USA Water Polo and LEN European Aquatics which governs 54 Countries. KAP7 is trusted by the top water polo experts in the world. Play with the Official Ball of the LEN Champions League. KAP7 has tapped into years of experience, proprietary technology, and the highest quality materials to develop the HydroGrip Ball. It is the best and longest lasting ball in the world. The HydroGrip has been designed to meet guidelines for local, national, and global specifications.