Muscleback PrecisionThe S-1 is a true blade, shaped for elite ball control. A thin topline, minimal offset, and compact blade length give it a classic profile at address. The clean lines and squared-off toe appeal to players who want no distractions and complete command over shape and trajectory.Grain Flow Forged FeelEach head is forged from a single billet of 1025E carbon steel at Mizuno’s facility in Hiroshima, Japan. This process creates a dense, responsive strike that translates every nuance of the swing into feedback. The result is a feel that’s unmistakably soft and precise, the hallmark of Mizuno blades.Refined for Pure StrikersDesigned for consistent turf interaction, the S-1 features a modest sole width with subtle camber and a slight bevelled leading edge. These details encourage clean entry and efficient exit through the turf, supporting crisp ball-first contact in all conditions.Minimalist Design, Maximum IntentVisually, the S-1 is as restrained as it gets, no unnecessary shaping or detail, just a clean muscleback silhouette. it’s a modern take on the traditional blade, stripped back to focus purely on performance, feel, and control.For the Game That Doesn’t Need HelpThe S-1 is built for players who don’t need correction or forgiveness from their irons. it’s made for those who rely on a consistent swing, precise impact, and the ability to flight the ball to suit the shot. In that space, it’s as close to perfect as Mizuno has ever made.Specifications Club Loft Lie Offset (inch) Length 3i 21 ° 60 0.13 39.25" 4i 24 ° 60.5 0.126 38.75" 5i 27 ° 61 0.122 38.25" 6i 30 ° 61.5 0.118 37.75" 7i 34 ° 62 0.114 37.25" 8i 38 ° 62.5 0.11 36.75" 9i 42 ° 63 0.106 36.25" PW 46 ° 63.5 0.102 35.75"
