Cleveland CG1. The Cleveland CG1 irons take traditional blades to a new feel and performance level. Made from Cleveland Golf's new patent pending CMM (Carbon Metal Matrix), CG1 irons offer a softer and more responsive feel. Designed with the better player in mind, CG1 irons have a slightly larger muscle in order to move the centre of gravity lower and deeper which promotes a higher ball flight, especially in the long irons. CG1 irons come in a mirror chrome finish.