These precise heel toe wings also called notch weighting serve to dramatically increase the MOI of these irons. They are definitely the most modern futuristic looking heads we have seen and they hit amazing!
If you are comparing these to the XL IIís you may notice that they are very similar looking and they are, but there are some very subtle differences, these are 2 mm longer from heel to toe and 2 mm shallower from the sole to the top for slightly more spin and a wee bit higher trajectory.
Score line length on 6 iron 52 mm. Face thickness 1.9 mm.