After 6 years of development - the introduction of BORON to MizunoÕs Grain Flow Forging process allows the JPX-850 Forged to overcome the distance limitations of traditional forged irons. MizunoÕs new material is 30% stronger than traditional 1025E steel billets Ð allowing for a thinner face and extreme ball speeds. The result is an incredible iron that combines Grain Flow Forged precision and feel with shocking distance. A combination that was unachievable before BORON. This new, thinner face is strategically reinforced by a Power Frame cavity which places weight to the extreme corners of the club head for maximum forgiveness along with increased distance. A clean, sleek design combined with these breakthrough technologies delivers an iron that looks and plays like nothing before. These irons come equipped with True Temper XP 115 steel shafts and Mizuno M-31 360 grips. Please contact us if you would like to customize lengths, lies, lofts, shafts or grips.