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Phil Mickelsons Project X series shafts

Golf Channel
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There has been a lot of talk this week regarding Phil Mickelson’s change to Callaway’s new FT-9 driver, but here is an interesting tidbit about his irons. Lefty played last Thursday and Friday at the FBR Open without True Temper shafts, the first time that’s happened since he switched from graphite to steel many moons ago. As we know, Mickelson missed the cut at the FBR, which is rare for him–in the three majors and 10 non-majors Phil has won since 2004, he has played True Temper's Project X series shafts.
In the off-season, Mickelson tested with KBS steel shafts manufactured by Boulder, CO–based FEMCO Steel Technology. He put these in the bag for the FBR Open and continued to play KBS yesterday, firing a 2-under-par 70 in the first round of the Buick Invitational at Torrey Pines. True Temper says they were very surprised to see Phil make the switch given the extraordinary success he has had with Project X; however, a source close to Mickelson tells me a set of his Callaway irons shafted with Project X is close at hand. It will be interesting to see which way he goes today.