Mizuno JPX 921 Hot Metal Golf Iron – SteelThe Mizuno JPX 921 Hot Metal Golf Irons in Steel pair Mizuno’s fastest ever ball speeds with a piercingly straight ball-flight and controllable landing angles.Faster Chromoly 4140MMizuno’s 3rd generation of designing and manufacturing irons using Chromoly – now taken to its limits. A re-engineered CORTEC face is now 0.2mm thinner across the centre point. Seamless Cup FaceA new variable thickness sole design allows the leading edge to act as a hinge, resulting in greater face flex and ball speeds. Harmonic ImpactPredicting vibration patterns dictated 3 additional sound ribs – producing a more solid sensation. Pearl Brush FinishAnti-glare to minimise distractions over the ball. Stability FrameExtreme perimeter weighting with toe bias for stability from off-centre strikes.