The Nike VR Pro Combo irons feature the all new X3X high-frequency groove system, which produces the most exacting Nike iron ever. The X3X grooves that are deeper and closer together to direct more water and debris away from the face, promoting optimal control. The long irons each feature a Pocket Cavity for more forgiveness on long shots, the mid irons feature Split Cavities for shot-shaping ability and control, while the short irons feature a Flat Back Blade design, resulting in unsurpassed feel and control in your short game.