The Large Extra Military is generally recommended for fine to normal hair.  The "Extra" in the brush name refers to its extra-stiff boar bristles.  The brush has 7 rings of tufts of  selected pure boar bristle which are set in a pneumatic rubber cushion that regulates the penetration of each tuft to gently, but effectively, condition the hair and scalp.  Overall size is 5 1/8 inches by 3 1/4 inches.  To keep the brush in tip-top shape a cleaning brush is included, as well as complete use and care instructions.