The Mizuno Pro M-13 and M-15, part of the all-new Modern Series. Sitting alongside the existing Signature Series (S-1 and S-3), the Modern Series represents a fresh evolution in forged performance. Engineered for players seeking a bit more speed, forgiveness, and playability, while maintaining the unmistakable Mizuno Pro shaping and feel. The Modern Series debuts with two distinct models, each designed for a specific type of ball striker. The M-13 features tour-preferred proportions and a faster, more consistent flight profile, while the M-15 delivers higher launch and additional forgiveness that blends smoothly through the set. Both retain the craftsmanship and forged heritage that define every Mizuno Pro iron. Integrated Construction 4 to 7-iron: Grain Flow forged HD 4135+ Chromoly face and neck. 431 Stainless Steel back part. Hollow-body design with tungsten weighting 8-iron: Grain Flow forged HD 4135+ Chromoly face and neck. 431 Stainless Steel back part. Hollow-body design. 9, PW & GW: Grain Flow forged HD 1025E Steel Body. 17-4 Stainless Steel back part. Partial hollow-body design. Improved Turf Interaction Improved turf interaction through sole shape and added bounce.