Introducing boron forgedafter 6 years of development ndash the introduction of boron to mizunorsquos grain flow forging process enables the jpx850 to overcome the distance limitations of traditional forged ironsmizunorsquos new material is 30 stronger than its traditional 1025e steel billets ndash allowing for a thinner face and extreme ball speeds the result is an incredible iron that combines grain flow forged precision and feel with the ball speeds of a modern distance iron ndash