The 4 stands for an S flex shaft which we rate with a swingspeed range of 93 to 107 mph. The B tells us the weight range of the shaft and we use B as a mid weight shaft range. D is for the lightest weight shafts for distance and C for the heaviest weight shafts for control. The 1 tells us it is rated for a low trajectory ball flight, 2 would be medium and 3 for high trajectory shafts. The S tells us this a shaft to help correct a slice. H would help correct a hook and M is not correction needed.
At 91 mph that puts you in the high range of an R flex shaft or in our MPF codes a code that would start with a number 3.
Date published: 2016-02-08