Srixon ZX4 MK II Iron Sets present a sleek, narrow look at address, plus a premium forged feel. But behind that clean aesthetic is maximum forgiveness plus powerful distance, all thanks to its hollow head design and extra-strong lofts. Features:- 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- Moderate sole width, our longest blade length, and our highest offset maximize the forgiveness of ZX4 Mk II hollow Irons while still offering an appealing look at address- Tour V.T. Sole takes turf interaction to a whole new level of detail