The Srixon Z-Star Tour Yellow Golf Balls provide exceptional feel around the green and distance control with the putter. These high-performance multi-layer golf balls have an extremely soft feel and a low compression. Srixon Z-STAR Golf Balls is the softer of the two Z-STAR Balls, featuring a combination of an ultra-thin urethane cover and a new dimple configuration that maximizes performance. Yellow is the most visible color in the visual spectrum and psychology has correlated green with calming and stress relief; therefore Srixon has combined the two colors based on these findings to tap into the player?s mind and expand the benefits of playing a better ball.