Pocket Bristle & Nylon Hairbrush BN4Pocket Mixture. Five oval rings of pure boar bristle and nylon tufts set into a pneumatic rubber cushion. Overall measurements 6"" by 2" with black Ruby handle. Fits easily into any purse or pocket. Regular brushing plays an important part in the condition of your hair. The Mason Pearson Hairbrush cleans the hair, stimulates the scalp increasing the blood flow to the roots. A natural conditioning oil sebum comes from a gland at the base of very hair;