My Callaway GBB Epic Fitting - Clubs, Grips, Shafts, Fitting - The Sand Trap .com
Here's the shaft flex you should play based on your swing speed
Wishon: “What shaft flex should I use?” – GolfWRX
Prestige Golfshire Club - Golf Myth #4 Truth: Swing speed determines the best possible shaft for the golfer. Golfers who swing around 90 mph with their driver should look at using a
Golf Shafts – Fitting and Flex Explained – Golfballs.com
High Flex Shaft for a High Swing Speed possible? - Clubs, Grips, Shafts, Fitting - The Sand Trap .com