Mizuno JPX 921 Hot Metal Iron Set (Left-Handed)Mizuno JPX 921 Hot Metal Iron Set Mizuno Hot Metal irons are known for being among the games best feeling game improvement irons out there. No need to sacrifice feel just because you are seeking distance and forgiveness. That is where the brands third generation Chromoly comes in. This material, along with the seamless CORTECH cup face increases flexibility and boosts ball speeds. Present in all JPX models, the Stability Frame adds perimeter weighting