Srixon Z-Star Golf Balls 2021 The Srixon Z-Star Golf Balls provide you with the ultimate performance. This Golf Ball features a FastLayer Core. This gives an outstanding feel and greater ball speeds, to give you confidence on the golf course. FASTLAYER CORE The Srixon Z-Star Golf Balls are soft at the center but firm around the edge. This FastLayer core offers greater ball speeds and a much nicer feel, inspiring you with confidence on the golf course. URETHANE COVER Featuring an extra thin, thermoplastic urethane cover, providing you with better spin and control. SPIN SKIN COATING Srixon has added an extra Spin Skin coating to provide you with even more spin and control. This additional layer is extremely thin, but it uses Slide-Ring Material to increase friction and maximise spin on chips and pitches. 338 SPEED DIMPLE PATTERN Featuring new, deeper dimensions to provide a penetrating launch. After impact and launch, the dimples generate lift, driving the ball upward and maximising glide distance during descent.