This Small Wheel Woolie 8” brush is the perfectly sized brush for tighter gaps and narrow spoke wheels. Also great on grills, around ornaments, bezels and in crevices that you can't reach with larger brushes. Completely metal free and will not scratch. Made of polypropylene, these brushes will not scratch or splatter dirty water like most twisted wire spoke brushes. The soft, dense carpet fibers will hold suds and transfer them to the wheel.