The KBS MAX .355" Graphite is designed for a wide range of players seeking to MAXimize the performance of their iron shafts with trajectory, spin and distance in a consistent, lighter weight package, making it easier for you to produce performance on every shot. Switch into KBS and MAX OUT YOUR GAME. Features: Designed for a wide range of players seeking to MAXimize the performance of their iron game. Performance lightweight graphite that produces the optimum trajectory, spin and distance. Based off of the same E.I. curve as all the KBS steel shafts and designed to offer slower swingers the ability to hit shots at a higher launch and spin without sacrificing control. Additional Details: Swing speed recommendations (#6 Iron) for MAX Graphite Iron Shafts: KBS MAX Lite Flex: 50mph or less KBS MAX A Flex: 51 to 59mph KBS MAX R Flex: 60 to 68mph