The XXIO 8 iron set features Dual Speed Technology, which maximizes the efficiency of a golfers swing. The newly created graphite shaft for this iron set reduces the clubs MOI and delivers a faster head speed than previous models. The XXIO 8 also features a heavier club head that produces more energy at impact and results in a faster ball speed and increased distance. The new face thickness design maximizes an expanded sweet spot on each iron. These irons are also available in a new steel shaft designed by Nippon, to offer solid feel and even better control.