Mason Pearson BN4 is the smallest hairbrush in the range and is made in a mix of wild boar hair and nylon. The Mason Pearson brush in a mix of wild boar hair and nylon is recommended from normal to heavy hair. BN4 is the right choice for very short hair and is an ideal travel companion and fits perfectly in the handbag. A Mason Pearson brush massages and stimulates the scalp, releasing the scalp's natural oils. When brushing through, the oil is distributed along the length of the hair, so that the hair gets a natural shine, as well as fullness at the base. Mason Pearson recommends 100 strokes a day - an investment in good hair for life!