Mizuno Golf is well renowned for manufacturing quality golf clubs and has used its expertise to use a performance based material to unveil the new JPX900 irons. The designers at Mizuno Golf have created a new material named Chromoly 4140M which gives all the adjustability of a forged iron, which means the head is softer for precise club loft and lie changes. This material has also found in the ultra thin face for extreme ball speeds and phenomenal distance.7naEi5yufrQ?rel