Mizuno Pro S-1 Irons [4-PW][RIGHT][STIFF][KBS TOUR 120]

Mizuno Pro S-1 Irons

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 optimises this experience, subtly refining vibration patterns to produce the purest, most satisfying feedback.

Developed and tested with input from our professionals, the S-1 incorporates a Channel Back Design that redistributes mass for greater vertical stability and a more consistent centre of gravity. This design works seamlessly with Mizuno’s Harmonic Impact Technology, which fine-tunes the feel by adjusting the club’s vibration frequencies to deliver even more responsive feedback.

Further Optimised Grain Flow Forged HD (High Density)
The S-1 iron is masterfully Grain Flow Forged HD from a single billet of 1025E Pure Select Mild Carbon Steel in Hiroshima, Japan — a testament to Mizuno’s heritage in precision forging. This advanced forging process creates a tighter grain structure, delivering the brand’s legendary buttery-soft feel through impact, while enhancing feedback and consistency across the set.

Channel Back Design
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.

Harmonic Impact Technology (H.I.T.)
Mizuno’s proprietary Harmonic Impact Technology works in tandem with the channel back geometry to fine-tune vibration frequencies, delivering a slightly firmer — but still satisfyingly solid — impact sensation. It’s engineered for players who desire auditory and tactile feedback that inspires confidence with every strike.

Copper Underlay
A thin layer of copper beneath the chrome plating adds a layer of nuance to the feel at impact. This feature subtly softens vibration, enhancing the feedback while maintaining a crisp response. Paired with H.I.T., it creates what Mizuno describes as the ultimate “sensory connection” between golfer and club.

Tour-Tested and Refined Sole Geometry
The sole design is carefully engineered and tested through tour input, featuring a slightly wider sole for greater stability through the turf. A rolled leading edge and cambered trailing edge minimise digging and allow players to maintain aggressive angles of attack with confidence.

Soft White Satin Finish
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.

Standard Specs & Availability

• Available sets: 4-PW / RH and LH
• Shaft: KBS Tour 120 Siff
• Grip: Golf Pride Tour Velvet