Pro S1 4-PW

The Mizuno Pro S-1 irons are pure muscle backs, designed for players who demand ultimate precision and workability. At the core of the Mizuno Pro S-1 is Mizuno’s Grain Flow Forged HD process, carefully executed in Hiroshima, Japan. Forged from a single billet of 1025E Pure Select Mild Carbon Steel, the S-1 delivers the unmistakably soft and responsive feel through impact that Mizuno is globally known for. The inclusion of a copper underlay further optimizes this experience, subtly refining vibration patterns to produce the purest, most satisfying feedback.

The innovative Channel Back Design subtly repositions mass behind the face to achieve a more stable vertical center of gravity, resulting in consistent launch conditions. Simultaneously, it offers a firmer, tour-preferred sensation, enhancing responsiveness without sacrificing the purity of feel.

The S-1 sole has been carefully refined through tour input, featuring a flatter camber profile, sharpened leading edge, and increased bounce angle. This design ensures smoother turf interaction—particularly beneficial for steeper swings—minimizing digging and allowing players to maintain aggressive angles of attack with confidence.

The irons are finished in a sophisticated Nickel Chrome Soft White Satin, offering a premium, tour-inspired aesthetic. Beyond its visual appeal, the satin treatment effectively reduces glare at address, promoting unwavering focus and visual clarity in all lighting conditions.

Loft ° Lie Angle Offset (inch) Length (inch)

24 60.5 0.098 38.75

27 61 0.094 38.25

30 61.5 0.091 37.75

34 62 0.087 37.25

38 62.5 0.083 36.75

42 63 0.079 36.25

46 63.5 0.075 35.75

Up Charge Shaft

Weight Trajectory

110g Mid-High