Srixon Golf- Z 545/Z 745 Combo Irons (7 Club Set) An ultra-soft forged 1020 carbon steel body is capped with a thin, high strength SUPIO steel face for higher ball speed Redesigned sole helps tighten shot dispersion with less turf resistance through impact Double Laser Milling increases surface roughness for additional spin and trajectory control in all conditions Z-545 Irons: 4,5,6 Z 745 Irons: 7,8,9,PW