"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.FORGED IN HIROSHIMA JAPAN: Grain Flow Forged HD at our legendary facility - for an identifiable and unsurpassed Mizuno feel. FASTER. FORGED. FIRST: Chromoly 4120 allows a clubface upto 0.5mm thinner for our fastest peak and average ball speeds from a full body Forged iron. SLEEKER COMPACT PROFILE: A shorter blade length throughout, bevelled training edge and reduced offset. CNC BACK MILLED: A 6.4% wider back milled slot increases stability from off center strikes – from a smaller clubhead. STABILITY FRAME: Additional perimeter weighting with toe bias for stability from off center strikes. PEARL BRUSH FINISH: Anti-glare to minimize distractions over the ball.スペック"