The Nike VR Forged Pro Combo irons feature a precision forged 1020 head construction with the X3X high-frequency groove system, which produces the most exacting Nike iron ever. It provides more grooves, which are deeper and closer together, resulting in more water and debris being channeled away from the face for optimal control. The long irons (3-6) feature a polymer filled Pocket Cavity for improved feel and more forgiveness on long shots; the short irons (7-PW) feature a Split Cavity for shot-shaping precision and control, resulting in unsurpassed feel and control in your short game.