6s stands for a 60 gram Stiff flex shaft. 6x for a 60 gram Extra Stiff flex shaft. 7s for a 70 gram Stiff flex shaft and 7x for a 70 gram extra stiff flex shaft. We fit Stiff flex shafts for driver swingspeeds in the 93 to 107 mph range and Extra Stiff flex shafts for swingspeeds of 108 mph and higher.
Date published: 2016-11-01