The Maltby MPF MAXFLEX extremely lite graphite iron/hybrid shafts have been designed to optimize trajectory and spin for slower swing speeds resulting in higher launch angles in the modern lower lofted hybrids and irons to produce maximum distance. Designed in four distinctly engineered flexes to custom fit swing speeds as low as sub 62 mph (LL Flex) up to 92 mph (R Flex).Slightly higher torque ratings aid in squaring the club face for tighter shot dispersion. Features: SF Flex (LL) a " 62 mph or below driver clubhead speed / slower tempo SF+ Flex (L) a " 62 mph or below driver clubhead speed / medium tempo A Flex - 63-76 mph clubhead speed / medium to fast tempo R Flex - 77-92 mph clubhead speed / medium to fast tempo