The Nike Vapor Fly irons are designed with professional profiles for enhanced workability. This iron set is split amongst different designs to provide you with the ideal balance in your set. The long and mid irons (4-7) feature a hollow cavity for superior forgiveness, the short irons (8-PW) are designed with a RZN pocket to combine stability with refined feel, and the wedges (AW & SW) have a full RZN cavity for shot-making creativity.