Multi purpose professional detail brush. 1.5 inch soft bristles are set in plastic ferrule. We change it to plastic ferrule because metal ferrule gets rusty and it might scratch car surfaces by accident. The bristles softness is perfect for cleaning AC vent, dashboard buttons, knobs and cup holder. Lots of detailers use it to clean wheel lug nut and any small gap areas. This is a "detailer's must" brush. We also have a smaller version of this brush for cleaning more delicate areas.