Yep, and we’ve already seen it.   Brandt Snedeker and Matt Kuchar have both routinely used Aerotech SteelFiber shafts in their irons throughout their careers. And keep in mind, these aren’t two fringe players struggling to keep a PGA Tour Card. Kuchar has 9 PGA Tour wins, 3 international wins and over $54 million in on-course earnings. Likewise, Snedeker won the FedEx Cup in 2012 and also has 9 PGA Tour victories. More recently, players like Abe Ancer (Mitsubishi MMT) and Bryson DeChambeau (LA Golf) have switched to graphite iron shafts.   And if we’re willing to look beyond the PGA Tour, you’ll see plenty of LPGA Tour players with graphite iron shafts.   I think the reason we haven’t seen more graphite iron shafts, specifically on the PGA Tour is for two reasons. First, is a lack of clear benefit. That might sound harsh, but there isn’t any wide-scale evidence that shows PGA Tour players are struggling to perform with existing steel shafts. Moreover, if we look back at momentous changes in golf equipment that resulted in relatively fast and near universal adoption  (solid core golf balls, graphite wood shafts), the performance implications were obvious and undeniable. That isn't the case right now with graphite iron shafts.   The second reason isn't as impactful, but it's a factor nonetheless. With graphite iron shafts, players have to consider and assess the impact to at least 50% of the clubs in his/her bag. That takes a lot of time and testing. The only real opportunity players have to do this is during the off-season, which is when players are also looking to spend time with family, travel and rest. This gets us right back to "if it ain't broke...." and round and round we go.