The most versatile brush ideal for the toughest to clean areas. Clear polypropylene bristles are heat-set into a heavy-duty polypropylene handle for professional long lasting durability. Uniquely designed polypropylene handle will not crack or absorb water and is treated to deflect odor and mildew. Hundreds of Polypropylene bristles provide just the right amount of a heavy-duty scrubbing that?s gentle to fishes both interior and exterior.