Wheel barrel brush is a soft low scratch risk bristles clean well while being soft to your wheels, and bend down as needed allowing you to fit into the tiniest of gaps, perfect for wheels with low clearance, tight gaps, large calipers, etc. The rubber end car protects wheels from scratching if the tip accidentally hits something while cleaning, and the rubber ring above the grip protect your hand from accidentally going bashing your knuckles against the rims if you get a bit too excited cleaning. The brush moves easily and the long bristles fend and flex to fit through gaps and to maximize leverage and agitation, allowing you to clean better. A great brush prefect for your detailing arsenal.