Callaway X Prototype
The Callaway Forged X Prototype Blade was apart of the Tour Authentic release and cannot be overlooked. They come from a company that has based their goals on forgiveness and not necessarily the workability achieved from a blade, which is why they are only offered in limited amounts.
If you can find a set, they will feature a X-Muscle flighted design which places the center of gravity in the shorter irons at the highest muscle point and progressively moves it to the lowest point in the longer irons. This allows for trajectory control which moves to the lowest in the long irons for high, soft landing shots.
They are also made from soft 1020 carbon steel and are forged by the famed Endo manufacturing facility. All in all these irons offer a good balance of forgiveness and feel when it comes to the blade style category.