Mason Pearson B4 Pocket 100% Boar Bristle Dark Ruby Fine Hair Brush, new in box. Mason Pearson Hair Brush Pocket B4 is generally used for fine to normal hair, short or long. With 5 rings of bristle tufts this is a small and neat, pocket size hairbrush! The unique rubber-cushion pad, made by hand using Mason Pearson's original techniques, allows for effective and efficient brushing. It is kind to use and gently massages the scalp. The plastic handle shape was developed from the original wooden models, which are still made in small quantities. The plastic handles are hand-finished to remove any sharp edges to feel comfortable in the hand.