Golf balls Srixon Q-Star Tour, smoother with tour-level performance. With the largest core in its class and FastLayer technology, Q-STAR TOUR is fast from the face and long from the tee. Its new SeRM urethane cover offers "one jump stop" control for the best combination of distance and turn. Specifications: Construction: 3 pieces. Cover material: Urethane. Cover thickness: 0.020" Compression: 72. Number of dimples: 338. Technologies: FastLayer Core: Offers distance and soft touch without compromise due to a gradual transition from the soft inner core to the firm outer edge. SpinSkin with SeRM: New urethane coating with flexible molecular bonds sinks deep into the grooves of the Wedge and iron for increased friction and maximum spin. Alignment: Side stamping helps in the alignment by standing on those crucial putts. 338 Speed Dimple Pattern: Providing penetrating ball flight in any condition, optimal dimple design increases lift and reduces drag to maximize distance.