It is the one that won the British Open:
Ernie Els had it in his bag.
fairwaygolfusa.com has the custom shaft options for you!
Available shafts include:
Aldila RIP Alpha
Mitsubishi Fubuki AX
Graphite Design Tour AD DI
and many more!
Get your shaft customized to go with the flow of your clubs.
As the club gets longer, shaft weight should be lighter.