Permanent Polyamide Constructparticlemail: Constructed of reinforced polyamide with pointed fringes and strong rotational power to remove tough accounts lacking shattering, clogging, otherwise damaging flue inside Permanent Executparticlemail: Constructed with wear immune reinforced polyamide for excellent durability and reusability Efficient Particulate Remellipsoidall: Effectively eliminates stubborn creosote and particulate amassment, reducing flue flame risks while improving ventilation and promoting finish coal combustion for strengthened firepit security Easy Extension & Usemail: Simple assembly/disassembly allows uniting to extension shafts for expanded reach and efficient cleansing Flexible Agreement: Highly flexible brush head works with exercises for rapid rotation, suitable chimneys from 4 to 20 in diameter, including round, square, metal, brick, and flexible liners, Manufacturer: XIBEIDIANZI