Grain Flow Forged HD (High density): From a single billet of 1025E mild carbon steel in Hiroshima Japan for unmistakable Mizuno feel through impact. Optimized graduated Tapered Blade: Provides more penetrating ball flight as loft increases, fine tuned sweet spot height and CG distance throughout the set.Thicker Muscle Behind Impact: HIT tested sound / feel.Copper Underlay: Provides incremental softer impact feel.Tour proven sole: A narrower, cambered sole requested by many players during prototype testing.Full Satin Brush Finish: Nickle Chrome Satin Finish for sophisticated look with glare reduction.スペックCLUBLENGTHSWING WEIGHTLOFTLIEBOUNCEOFFSET3i39.0D22159.530.1024i38.5D2246030.0985i38.0D22760.530.0946i37.5D2306140.0917i37.0D23461.550.0878i36.5D2386260.0839i36.0D24262.570.079PW35.50D3466380.075