Mizuno jpx balls 12 pack these mizuno jpx balls 12 pack are aerodynamically designed for extra airtime they feature a highly resilient core that promotes less spin which leads to increased distance an inner cover that allows for a higher initial ball speed and an outer multi blended polymer cover the 512 dual energy dimple design enables extra airtime for more carry golf balls 12 pack aerodynamic design extra airtime trajectory mid high feel soft spin on short game