Crafted by Callaway Chief Designer Roger Cleveland with direct input from Callaway's Tour players, the Tour-inspired styling and soft carbon steel construction provide the RAZR X Muscleback irons with precision shot-making ability, incredible feedback and workability. The Flighted CG design and Muscleback shape generate consistent, Tour-level trajectories with unparalleled playability from a blade irons. Updated grooves ensure that these irons are conforming for play.