Nike® SS 4D graphite irons (4-AW) feature progressive technology that sets up clubs exactly how you envision them. The slingback is positioned strategically on each club head to achieve desired ball flight. The variable offset in long and short irons boosts the playability of each club and the workability of each shot. The head shape change is extremely forgiving, while enhancing control and accuracy when you need it most. Features Slingback positioned strategically on each club head to achieve desired ball flight needed Variable sole width changes to optimize launch angle and workability Progressive offset in long irons for high, straight shots Decreased offset in shot irons for precision Head shape change is extremely forgiving, while enhancing control and accuracy when you need it most Long irons offer hybrid-like forgiveness Mid-size profile of the short irons enhances control and accuracy