Callaway Tour iZ Golf Balls (12-Pack) A new, refined HEX aerodynamics pattern with 6 sub-HEX geometries increases distance by reducing drag The higher-resiliency 2nd generation dual core construction increases ball speed for a wide range of swing speeds The soft urethane cover uses a new proprietary blend that plays softer Longer distance, better accuracy And cutting through the wind with a stronger, more penetrating ball flight Lasts longer and generates Tour-level greenside spin