Narrow hardwood block enables enhanced pressure transfer for more effective scrubbing. Two threaded handle holes allow you to switch orientation to achieve even bristle wear. For use with threaded 1 1/8-inch diameter handles (sold separately). Hardwood Block-Stiff Polypropylene Bristles. Bristle Material: Polypropylene; Brush Length: 10″; Bristle Length: 2″; Bristle Color: Cream.