The Autoflex shaft was not intended to be only used as a long drive shaft. Rather, Dumina Co. intended the shaft to help make the game of golf easier by helping slow and average swing speed golfers swing faster without swinging harder. Having said that, the Autoflex shaft line up can cover from 65mph to 150+mph swing speeds.
LIGHTER - Up to 20-30g lighter than conventional driver shafts to increase speed and decrease body strain.
CONSISTENCY - The shaft automatically optimizes the transfer of energy despite different swing speeds.
INCREASED DISTANCE - Increases head speed while providing stable swing posture for better distance and accuracy.
The unique characteristics of Autoflex shafts make it lighter than conventional shafts with a much lower CPM. Due to the more flexible nature, a higher swing weight may cause the club head to wobble on the downswing transition. This may result in off-center impact for loss of distance and accuracy. A swing weight of D1 is found to be good for many golfers, but some have seen excellent results at D0 and even up to D3~D4 (for sf505x and xx shafts).
The raw uncut length is 45 inches, so when fitted to a driver head comes to about 46.5~47 inches. There is no ideal length and the butt end can be trimmed to make any total driver length depending on individual golfer preference (between 44~47 inches).
SF305X / 41gram / Approx. 170 CPM / Ladies / Swing Speed 65~90 mph
SF405 / 44 gram / Approx. 180 CPM / Mens / Swing Speed 85~100 mph
SF505 / 50 gram / Approx. 210 CPM / Professionals / Swing Speed 95~105 mph
SF505X / 53 gram / Approx. 220 CPM / Long Drive Player / Swing Speed 100~110 mph
SF505XX / 57 gram / Approx. 230 CPM / Long Drive Champions / Swing Speed 110+ mph
** Each models have the available shafts for Driver, Fairway wood, and Utility. ( Iron shafts available in SF405 and SF505. )