Faster and faster Chromoly 4140M: The JPX921 Hot Metal represents Mizuno's third generation of designing and manufacturing irons using Chromoly and as a result, the CORTECH face, is now 0.2mm thinner across the centre point.
Seamless Cup Face: A new variable thickness sole design allows the leading edge to act as a hinge, resulting in greater face flex and ball speeds.
Harmonic Impact: Predicting vibration patterns led to a trio of additional sound ribs - producing a more solid sensation at impact.
Stability Frame: Extreme perimeter weighting with toe bias for stability from off-centre strikes.
Pearl Brush Finish: Anti-glare to minimise distractions over the ball.