I have
Callaway x-18
irons with uniflex shafts. Kind of feel like a little stiffer than regular. I like them.
Here is the description from the
Callaway web-site:
"
Uniflex
A shaft designed to fit a wide range of golfers. The shaft is created to work with swing speeds of 75-95 MPH. This covers most golfers. The Uniflex (or one flex) has worked very well for
Callaway for years in both the Memphis "10" shaft that came out back in the mid 1990's all the way to the Constant Weight Steel Uniflex that comes in the most current product lines. It is a lightweight shaft with a mid-kick point