Lightweight Design-Air X Irons feature a lightweight design to promote great feel, and effortless speed for the smoothest swing tempos Variable face thickness-A variable face thickness face design is thinner in the heel and toe to promote more speed on off-center hits Low Profile Design-A low profile, cavity back design with greater lofts will help launch it higher and longer effortlessly Offset Design-In addition to more heel weighting, a new hosel design with 20% more offset helps to further eliminate a golfers' slice so they can find more fairways