Improvements to the cavity structure helps to suppress reverberation at impact while maintaining the soft impact feel of a forged iron, further improving the feel of the XXIO Forged Irons. By enlarging the thin area behind the face at the toe and heel, the repulsion area of the XXIO Forged Irons has been increased by 3% helping to decrease distance loss. The newly developed MX-5000 carbon shaft and N.S. Pro 940GH DST steel shaft are now lighter than in the previous XXIO Forged Iron models, with the center of gravity moved closer to the grip to lighten the overall shaft weight, resulting in improved distance through each iron in the XXIO Forged range.