Detailer's Garage Wheel Woolie Brushes (3 Piece Kit) - Scratchless Brushes for Wheels/Rims Soft fibers will not scratch delicate and expensive wheels! Made of 100% Polypropylene - NO METAL PARTS! A perfect brush for every groove and area (3 brush sizes) Kit includes 18", 12" and 9" brushes Designed to remove road grime and brake dust without damaging your wheels.