Shaft: Steel N.S. Pro 840 Regular Flex * Some of clubs have extra epoxy on the rear of club in cavity, will NOT affect club performance* M CGB pushes the limit of irons engineering for maximum distance throughout the entire set. Starting with a 2mm face thickness, every iron achieves consistently high COR, making it our fastest set from 4-PW ever. Combine this with ultra-low CG placement, and golfers will achieve high trajectory and optimized spin rates. Beyond distance, M CGB delivers full-face forgiveness throughout the bag. With a multi-material head construction, Speed Pocket technology, and Face Slots, M CGB creates high MOI with increased ball speed across the entire clubface for amazing consistency, even on mis-hits. Further enhanced with Geocoustic engineering, golfers will experience finely tuned sound and feel. The precision-shaped head, featuring an advanced Hybrar damper and 3D sound-managing badge, works to dampen vibrations and soften feel for exceptional shot-making ability.