Callaway X Utility Iron! Now available for pre-order at fairwaygolfusa.com!

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:
KBS C-Taper
KBS Tour
Aldila RIP Alpha
Project X
Dynamic Gold
Mitsubishi Fubuki AX
Graphite Design Tour AD DI
and many more!
Get your shaft customized to go with the flow of your clubs.
General theory:
As the club gets longer, shaft weight should be lighter.