This iron is a second generation of the original Slingshot which incorporates a larger head and re-positioned weight. The 29 grams of saved weight was moved back in the head for increased MOI for less twisting at impact. The Slingshot OSS irons use 3-D flow weighting so the weight is positioned where it needs to be for the correct ball flight. The clubfaces are CNC milled to control trajectories and spin rates. The Nike Slingshot OSS irons made the 2006 Golf Digest Hot List.