The Maltby MPF MAXFLEX graphite wood shafts have been designed to optimize trajectory and spin for slower swing speeds resulting in higher launch angles that 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 face of modern oversized drivers at impact for straighter and longer drives. 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