HL4 Irons are made with the extremely soft 431 stainless steel, providing the optimal feel for players of all levels. The HL4 Irons incorporate an expanded undercut cavity to provide maximum forgiveness, power and consistent performance. The vast undercut cavity allows weight to be moved away from the face and into the sole for a higher MOI and high CT with faster ball speeds. This undercut cavity also provides a higher launch angle and enhanced forgiveness.