Srixon Z-STAR XV Golf Ball 12pk White S.T.A.R Performance S-T-A-R PERFORMANCE - The process of precisely tuning the balls performance to enhance total playability on every shot LARGE AND HIGHLY RESILIENT SOFT ENERGETIC GRADIENT GROWTH CORE DUAL-CORE PERFORMANCE - The Z-STAR XV utilizes a dual core construction to optimize the combination of trajectory and spin off the tee