Josheisenhardt
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Project X Catalyst 55 5.0 - shaft type?
Josheisenhardt replied to Eric95403's topic in Golf Balls/Shafts/Grips
I am a certified fitter for Callaway and to answer your question the 5.0 refers to a senior flex shaft. Normally golfers with a driver club head speed between 75 to 85 mph need a senior flex. Good luck.