Why choose the Rock & Ruddle natural bristle hairbrush? Natural bristles have microscopic scales that release and spread the natural oil produced in the scalp (sebum) down each hair shaft making it shiny, supple and healthy. The bristles also keep the hair clean as the scales pick up dirt and excess oils as the go through the hair. The rubber cushion pad minimises pulling on the hair. A Rock & Ruddle hairbrush both cares for your hair and feels comfortable to use.