Hard working 21 Inch Detail Brush with Salt and Pepper Polystyrene Bristles for firmness to remove dirt and grime. Quality heavy-duty UV resistant 21 inch handle and block is heavy-duty UV resistant poly foam. The poly bristles are manufactured to withstand your strongest chemicals, detergents, and solvents. This Rim Brush will not break down under repeated moisture use. This is more than a Fender and Wheel Brush, it is safe for all other extra dirty car and truck areas too. An Econo Brush that does not give up quality for price. It is a professional car detail brush used by detailers and car dealers all over the country.