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.

Progressive Grooves, The 4i–7i feature wide grooves, ideal for longer shots in all conditions. The 8i–AW have deeper, closer set grooves which cut through grass and debris to enhance spin on approach shots. Laser milling between each groove, on every loft, enhances friction in all conditions.

Hollow Iron Shapes, Moderate sole width, Srixons longest blade length, and their highest offset maximize the forgiveness of ZX4 MKII hollow Irons while still offering an appealing look at address.