Steel heads with a high quality Thomas stiff flex graphite shafts. They are pro line brand quality.
The alignment bar on the top of the irons was not just a gimmick It works. They are also longer and more forgiving then my old irons.
For me there is no downside to these irons.They go long and hit as good as any iron that I tryed with the added feature of the algnment bar like the one on my putter.