The rac Tour Preferred Combo Set features rac CB (cavity back) irons for the 2-6 iron and rac MB (muscleback) irons from 7-9 iron, plus a rac chrome 48-degree wedge. The rac CB is a coin-forged cavity back that combines the forgiveness of perimeter weighting with blade-like features that include a compact shape, thin sole and thin top-line. Highly workable, the rac CB's high MOI provides greater stability on mis-hits in the middle and long irons, where it's needed most. The rac MB, a traditional muscleback blade, delivers the keen workability and shotmaking precision that only a blade can. Skilled players that enjoy being precise will be able to produce a variety of shots with the rac MB. The rac 48-degree wedge (from the original rac wedge line) features a teardrop-shaped and a thin sole that allows for crisp full shots and sensitive greenside touch shots. All irons in the rac Tour Preferred Combo Set incorporate TaylorMade's patented rac technology, characterized by two distinctive Feel Pockets that channel impact energy to strategic areas of the clubhead. In addition, the rac Tour Preferred Combo Set is equipped with Dynamic Gold shafts and Lamkin Crossline Grips. The Tour Preferred line of golf clubs is identical to the clubs that TaylorMade makes for tour pros.