For nearly his entire professional career, four-time major winner Rory McIlroy has used Project X 7.0 shafts in his irons and Project X 6.5 shafts in his wedges. Jordan Spieth, a three-time major ...

Graphite shafts are nothing new. They’ve been in drivers and fairway woods for decades, nearly every hybrid comes with a graphite shaft, but irons are a different story. For many golfers, steel has ...