Here is the round brush ideal for cleaning round chimneys. This10 Inch Diameter Round Master Sweep round polypropylene Brush Head features the NPT type connector compatible with most existing equipment. The round polypropylene brush bristles are designed to remove soot from coal, oil, and gas flues that may corrode steel bristles. This brush is ideal for a top down cleaning of the toughest chimneys. This brush is durable and tough enough for the everyday demands of professional chimney cleaning services. Professional"s Choice round chimney brush head with a 10-inch overall diameter. Features the newer TLC-style torque lock connector. Polypropylene bristles are designed for removing soot from fossil fuels in coal, oil or gas flues where the acids may deteriorate steel bristles. Brush head has a has a single spiral 0.177 dia. spindle design. The 0.075-inch poly filaments are 7 inches of fill. Professional"s Choice brushes are moderately priced chimney brushes that are rugged enough to stand the everyday demands of the busy sweep.