The Mizuno Pro Fli-Hi has been re-engineered for greater speed, launch, and feel. MAS1C Maraging Face: Delivers greater energy transfer and faster ball speeds across the clubface Internal Tungsten Weighting: 23 grams of weight low in the head for elevated launch compared to traditional long irons. Black Ion Finish: Fully blacked-out plating creates the illusion of a more compact profile. Thinner Topline from Complex Welding Process: Moving the weld line allows for thinner topline, as well as, greater flex and ball speeds from low on the face. Increased Bounce Angle: Increased by a degree for improved turf interaction and tour confirmed. Harmonic Impact Technology: Fine tuned head geometry delivers ideal impact feel and feedback Hybrid Muscle Back: A high performance hollow body hybrid structure is formed by utilizing a Grain Flow Forged Chromoly Face and neck part, fused to multi-material body Multi-Material Construction: Strategically positioned exotic materials to help optimize launch and forgiveness Hollow Body Construction : Achieves optimized weighting through multi-piece construction