Callaway Golf Men's Apex Irons Set Ultra Hot Face: Thin 455 Carpenter Steel Face Insert increases ball speeds 1mph to 2mph for more distance Tungsten Sole Inserts: Tungsten weighted inserts in the sole of the long irons produce a lower CG, higher launch angels and maximum forgiveness Forged Carbon Steel Body: 1020 Forged Carbon Steel body delivers soft responsive feel High Performance Wide Groove: New high performance wide space groove delivers more consistent spin from a variety of lies Premium Shaft Offerings: New True Temper XP95 steel shaft offering delivers high launch angles