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The JPX921 Forged iron integrates the power of Chromoly into a full-body Forged iron for the very first time. Initially applied in Mizuno’s Hot Metal irons – Chromoly has made the cross over to a Mizuno’s forgings with staggering results. The fastest ball speeds Mizuno has ever produced from a fully Forged iron – a treat for both the senses and the scorecard. Grain Flow Forged in Hiroshima Japan. A wider back milled slot increases stability from off centre strikes C from a smaller clubhead Chromoly 4120 allows a clubface upto 0.5mm thinner for our fastest peak and average ball speeds from a full body Forged iron Additional perimeter weighting with toe bias for stability from off centre strikes.