King f7 one length irons the king f7 one length irons debut as cobrarsquos first ever single length iron set inspired by rising pga star bryson dechambeauone length one swing one consistent result cobrarsquos first ever single length irons set featuring new pwrshell technology provides simplicity in every swingproper setup includes foot positioning spine angle and ball position and many other variables these variables change as you switch between longer and shorter le