Srixon Z Star X Golf Balls Spin - Turned to increased distance on the driver while providing unparalleled stopping power on approach shots Trajectory - Designed to produce an aggressive ball flight that maximizes distance regardless of weather conditions Acceleration - Developed to maximize the energy transfer to the ball for more ball speed Responsiveness - Configured to provide great touch and feel greenside Geared toward higher swing speeds for extreme tour distance (105+mph driver swing speed)