The KBS 560/580 is a performance shaft for the developing player/p> KBS has changed the direction and progression of younger developing players and their needs. Enter the KBS 560 and 580 Series. The first golf shaft on the market developed specifically for a Junior Developing player in mind. Both shaft weights consisting of up to one full club length longer in distance and consistency, as well as generating optimum spin with a more consistent,controlled ball flight and club efficiency. Features Designed for the younger developing player and their needs. Designed to produce up to a full club more distance in irons for the younger developing player, as well as generate optimum spin with a more controlled and consistent ball flight. Trimming Instructions