MizunoMP-59 irons have a smaller head
The new Mizuno MP-59 irons, Mizuno uses titanium for a completely different purpose-forgiveness. Golf club makers fell in love with titanium because it's stronger and lighter than steel. That means designers can make thinner driver faces, which creates discretionary weight that can be repositioned in other areas to improve performance. While the MP-59 is made from steel, 12 grams of titanium are forged into a pocket behind the face of each club. (It's the slightly darker material in the photo above.) Mizuno says the titanium allows the clubs to maintain the ideal amount of thickness behind the impact area for solid feel while automatically redistributing the weight to the heel, toe and sole of the club.