The MP-59™, the next generation of our award winning Ti Muscle™ Technology, delivers full cavity forgiveness in a player's half cavity design. During the elaborate Grain Flow Forging process, the pure Titanium material is forged into the muscle of the MP-59 to deliver a 5% larger Sweet Area compared to the MP-58, the iron that debuted Ti Muscle Technology while taking home "Editor's Choice" in Golf Digest's 2010 Hot List.