Yonex Ezone NS200 SD Irons The proven Power Flow Weight System adjusts the position of the visible weight within each iron to promote quality of strike Double Undercut Cavity increases the size of the sweetspot and the New Sole Construction reduces friction with the ground New Sole Construction Design: A reduced contact area between club and ground means less resistance and more club head speed. Proprietary Yonex NS200 shaft for unmatched quality and greater impact speed