The Srixon ZXi4 game-improvement iron features a hollow-body construction and the widest sole, the longest blade length, and the most offset in the ZXi family for maximum forgiveness. The ZXi4 is surprisingly compact, resembling a player's distance iron at address. Srixon's new i-FORGED construction provides the type of feel typically reserved for a one-piece forged iron.

Srixon utilizes artificial intelligence to strategically mill a network of grooves, channels, and cavities into the back of the ZXi4's face. This variable thickness pattern, called MainFrame, vastly improves COR and forgiveness by maximizing the face's capacity to flex, resulting in explosive ball speed on center strikes and preserved speed on mishits.