Handy Sensitive Hair Brush SB3. If you're suffering from hair loss or thinning hair or your hair is fine, it needs to be handled with care. The Mason Pearson Handy Sensitive Hairbrush uses specially selected fine boar bristles to gently massage the scalp and stimulate natural oil production for healthier-looking, shiny hair. Often used for very fine or thinning hair, people who are losing their hair for medical reasons, including alopecia and chemotherapy, sensitive scalps.