Shafts come in varying degrees of flexibility. Low handicappers need more stiff shafts, while high handicappers should use more flexible shafts. A shaft that is too flexible for your swing speed may cause inconsistent release points. If the shaft is too stiff for your swing speed, that'll cause you not to produce the maximum launch trajectory and swing speed. Typically, shafts are labelled as: L, which stands for ladies A or M, which stands for amateur or senior flex R means regular S for stiff X denotes extra stiff For high handicappers, we suggest using a shaft that is labelled A or M to maximize your ball speed, launching angle, and spin rate.