Mizuno MX-300 4-GW Iron Set with Steel Shafts The grain flow forged MX-300 Irons with Y-TUNE PRO technology are the perfect players spec iron with enhanced game improvement technologies. The head specifications of the MX-300s provide a more traditional look with a minimal progressive offset — a compact head size and modest sole width to deliver the look for an aggressive player profile. The full cavity utilized in the MX-300 irons contains the reconfigured Y-TUNE PRO technology for enhanced feel and ball flight control, with added forgiveness. The milled pocket cavity (#3-7) redistributes 12 grams of discretionary weight low and deep to provide a high penetrating launch, while the scoring irons (#8-GW) utilize a solid power bar design for maximum solid feel and pin attacking control. The sole of the MX-300 irons is dual cambered with a generous leading edge bevel and rolled trailing edge to minimize turf drag and reduce digging through impact. The MX-300 irons are the perfect weapons for the player looking for the combination of feel, forgiveness and ball control. The stock shaft is the True Temper Dynalite Gold XP.