Mizuno MP-15 irons
The new MP-15 from Mizuno is the latest advancement in Mizuno's design concept of combining titanium and steel in an iron clubhead.
Mizuno has plenty of expertise in the combination of titanium and steel. The MP-58 and MP-59 – blending lightweight titanium in the back cavity with heavier forged carbon steel in the body and perimeter – were forerunners to the MP-15.
For the MP-15, Mizuno used grain-flow forged 1025E "Pure Select" mild carbon steel to produce the body of the iron. Next a Titanium Muscle insert is forged directly inside the 1025E steel framework.
"It forms a very rigid mechanical bond between the carbon steel and titanium," said David Llewellyn, Mizuno’s manager of hardgoods research and development.
The results of this process, Lewellyn said, are an extremely solid feel and additional forgiveness because of the placement of more weight on the perimeter.
Llewellyn also explained the function of a new lightweight badge in the back of the MP-15.
"It's multi-piece, and it fills a larger volume," Llewellyn said. "We're able to move around even more weight."
The use of titanium, plus the new badge, makes 38 grams of weight available for precise placement by Mizuno engineers, Llewellyn said.
"(Former world No. 1) Luke Donald was heavily involved in this project," Llewellyn revealed. "He has such a keen sense of feel. We would never sacrifice feel, because this is one of the qualities that the MP irons are known for."
Purists often don't like to talk about forgiveness, but this clean-looking iron is meant to be a combination of classic appearance and modern technology.
The retail price of eight irons (3-iron through pitching wedge) is $999.99. They will be available at retail Sept. 19.