Srixon Z-Star XV Golf Balls Now in its sixth generation, the Srixon Z-STAR XV is a premium four-piece golf ball that provides maximum distance and gives skilled players complete tour performance from tee to green. Available in Pure White and Tour Yellow, the new Srixon Z-STAR XV delivers maximum distance for skilled players. Featuring a new Fast Layer Core and 4th generation Spin Skin with SeRM, the sixth generation Z-STAR XV offers tour-caliber performance in a premium, four-piece construction for maximum distance and feel. FastLayer Core The new FastLayer Core is soft in the center and gradually becomes firm around its edge, providing high-speed players exceptional feel and tremendous ball speed for maximum distance. 4th Generation Spin Skin with SeRM A new urethane coating with flexible molecular bonds that dig deep into wedge and iron grooves, maximising spin for more control and more stopping power. 338 Speed Dimple Pattern Offering less drag and more lift, the 338 Speed Dimple Pattern boosts overall distance and flies straight, even in the toughest wind conditions.