KING® F8 Variable and ONE Length™ irons are equipped with COBRA CONNECT™. Automatic shot tracking technology Powered By Arccos™. The first truly smart set. It seamlessly records and analyzes your shot data in real time to help you make smarter, data-driven decisions and shoot lower scores. Technology proven to improve your game by up to 5 strokes. It's not just the future of the irons game, it's the future of the game. Period.