2 1/2" wide flow-through plastic block with threaded 1 1/8" diameter tapered handle hole (handle not included). Vinyl bumper protects vehicle finish. Self-flagged polystyrene bristles for soft yet effective scrubbing. For use with any standard thread handle. Bristle Material: Polystyrene; Bristle Length: 2.5"; Brush Length: 10"; Bristle Color: Black; White.