ZX5 MKII Irons ZX5 Mk II is the perfect union of razor-sharp looks, power, and playability- combining a premium forged feel, advanced ball speed, and distance technology. Key Innovations: Mainframe MainFrame is a variable thickness pattern of grooves, channels, and cavities carefully milled into the backside of the Iron face that maximizes flex at impact Players Distance Iron Shapes A slightly wider sole with moderate blade length and offset help ZX5 Mk II cavity back Irons give attuned golfers