Mason pearson b1 brush large extra cleans the hair while stimulating the scalp and increasing blood flow to the roots sebum which is a natural conditioning oil comes from a gland at the base of every hair follicle and brushing will help to spread it along the length of the hair in order to give it strength and suppleness while providing a healthy sheen it is ideal for normal fine or damaged hair it is comprised of 8 rings of carefully selected stiff bristle tufts which are set in a rubber