Brush head made of nylon material. high-temperature resistance. anti-aging. not easy to corrode. making the sweep more efficiency. Also. it scratch the inner surface of the chimney flue 15 poles + 1 brush head + 1 M8 thread: Nylon thread can be bent and lengthened by 15poles. the length is 41cmthe diameter of brush head is 10cm.the brush hair is 4cm. Great degree of flexibility. perfect gets through flue bends Easy to assemble and disassemble. and you can connect multiple rods to extend your reach. The rods are flexible which can perfectly get through those tough flue bends. Can be used with an electric drill. with the help of large rotational force. the bristles can remove even the most stubborn build up inside the flue or chimney. Helps prevent flue fires. Perfect for cleaning your chimney from the top down or up through your fireplace. Cleaning your stove by yourself and save money. (zhongchengdaye)