The Nike Slingshot 4D irons add progressive change to four critical areas of performance to create irons that play how you need them to, when you need them to. The Slingback design is positioned strategically (low and back in long irons; higher and forward in short irons) in each club to achieve the desired ball flight. The Slingshot 4D irons have a variable sole width that narrows progressively throughout the set, with long irons are wider for higher launch and short irons are thinner to provide greater control. Offset in the long irons make it easier to square the face and hit high, straight shots. Incremental deceases in the mid and short irons ensure precise shot making with the scoring clubs. The Slingshot 4D long irons offer hybrid-like forgiveness and high, soft-landing shots. The mid-size profile of the short irons enhances control and accuracy