The TaylorMade Firesole Irons feature different material combinations throughout the set to add forgiveness in the long irons, and playability in the short. The Long irons in this set are made of titanium, with heavy tungsten sole weights to help add forgiveness on mishits and get the ball airborne. The Mid irons are made of steel with heel/toe tungsten weighting to increase the sweet spot and stabilize mis-hits. The short irons in this set are made of nickel to provide feedback on short, delicate shots.