What it is: The Sensitive is a softer bristle version of the Handy Bristle brush. It is best suited for very fine or thinning hair of medium to very-long length. What it does: Its 6 rings of gentle pure boar bristle tufts are set in a pneumatic rubber cushion that regulates the penetration of each tuft to gently but effectively condition the hair and scalp. What else you need to know: Overall size is 8 1/2 inches by 2 1/2 inches. To keep your brush in tip-top shape a cleaner brush is included as well as complete use and care instructions. *Note: The Sensitive s bristles are rather soft so unless your hair is very fine and thin stiffer bristles will be required to reach down to your scalp. Consider a Pure Bristle model if your hair is of fine to normal thickness. If your hair is described as fine but a lot of it a Bristle & Nylon model is recommended. Product Options Available are as follows: Option: SB3 - Dark Ruby - Mason Pearson Handy Size SB3 Sensitive Boar Bristle Brush;