Adams Golf Idea Pro Black CB 2 Irons, Set of 8 (4-GW) The new Idea Black CB2 irons are tour proven and designed to deliver performance and workability with forgiveness. A world class set of eight irons forged from soft 8620 carbon steel. Vibration absorbing cavity design for optimal feel and sound. Dual perimeter weighting increases forgiveness and lowers the center of gravity. Each head has milled grooves that comply with 2010 USGA competition requirements while maximizing spin from all playing conditions. Progressive offset optimizes trajectories and distance through the entire set. Four way cambered, mid width sole, reduces turf interaction for consistent ball stricking and shot making.