The Mizuno Pro Irons are the result of a longstanding connection between Mizuno's club engineers and the legendary Grain Flow Forging plant in Hiroshima, Japan. This unique relationship has enabled the creation of increasingly intricate designs flawlessly incorporated into the finished equipment. Every fraction of a millimeter and subtle curve has been meticulously considered, shaping the future of golf club technology. FEATURES Nickel Chromoly 4335 Hollow Body Construction Internal Tungsten Weighting for elevated launch Harmonic Impact Technology is applied to best match the vibration patterns Increased bounce angle for improved turf interaction. Offset face weld for greater shot shape adjustability Black Ion Finish for a modern appearance