Mizuno JPX-850 Forged Irons   After 6 years of development - the introduction of BORON to Mizunos Grain Flow Forging process allows the JPX-850 Forged to overcome the distance limitations of traditional forged irons. Mizunos new material is 30% stronger than traditional 1025E steel billets \" 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.   Tech Spec Grain Flow Forged 1025 BORON: 30% stronger material for thinner face and longer distance while delivering soft, solid, consistent feel. Power Frame: Enables entire face to flex for increased ball speeds and distance. Ultra CNC Milled Pocket: Higher launch angle and increased ball speeds in 4 through 7 irons. Shaft: TRUE TEMPER XP 115 - R300,S300