The Mizuno JPX 900 Forged irons combine a 1025 Boron head material with Mizuno’s patented Grain Flow Forging. They have a new Cor Tech Design in addition to a power frame for more stability across the club head. They have a large rebound area to optimize ball speeds on center hits as well as across the entire face. They also have a re-engineered CNC Milled pocket that saves 21.5 grams of weight to the power frame for added forgiveness. These irons ship out 9/16.