The ncaa men's and high schools boys official kap7 size 5 hydro grip water polo ball has quickly become the go-to choice for amateur and elite water polo players alike. Kap7 has tapped into years of experience, proprietary technology and the highest quality materials to develop the hydro grip ball. It is the best and longest lasting ball in the world. The hydro grip has been designed to meet guidelines for local, national and global specifications. Nfhs and ncaa ball rules require the majority of the ball to be yellow. Kap7 hydro grip nfhs and ncaa approved balls: yellow, yellow/navy, yellow/black, yellow/green, yellow/red.