Callaway Golf Men's Apex Pro 16 Irons Set Tour influenced shaping and design: this is a classic look that the best players want to see, and their extensive Input played a huge role in how we designed this set Soft feel: the 1025 mild carbon steel and advanced quadruple net forging creates the soft feel that better players prefer. Specialized Blended Set Design Progressive cg for playability and precision: our multi-material design optimizes center of gravity of each club. The long irons have more Offset and a tungsten insert to lower cg for higher launch. The opposite is true for the short irons (6-aw)