Nike CCi Irons. New for 2007. Aimed at mid-to-low handicap golfers, Nike's CCi (Composite Cavity Insert) irons combine classic clean lines with cutting edge technology. The composite Cavity Insert Technology enhances forgiveness and feel. Constructed from 431 stainless steel (which is 25% softer than 17-4 stainless), a high-density tungsten weight plug lowers the centre of gravity to increase forgiveness. Two polymer-filled sole ports further dampen vibration to achieve a softer feel than conventional cast clubheads. The CNC milled flat faces ensure uniform ball compression for predictable distances and shot patterns