Flex refers to how much the shaft of the golf club bends during the swing. There are generally five ratings for flex: extra stiff, stiff, regular, senior, and ladies. Your optimal flex will vary based on your technique and driver distance.As shown here:
Iron sets typically include seven or eight clubs consisting of 4, 5, 6, 7, 8, and 9 irons in addition to a pitching wedge and sometimes a gap wedge.
