The brush wire is made of nylon and metal material, which is resistant to high temperature and is not easy to corrode. This product is mainly used for cleaning the inner wall of steam engine chimney pipe. With the design of powerful clean, flexible and long-term dexterity, it is a must-have for chimney cleaning. Item Name: Dryer Duct Cleaning Tool Material: Nylon, Galvanized Iron Wire Rod Quantity: 6/8/12Pcs (Optional) Features: Durable, Easy to Use, Dryer Duct Brush Rod Diameter: 8mm/0.31" (Approx.) Rod Length: 410mm/16.14", 600mm/23.62" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 6/8/12 x Flexible Rods 1 x Brush Head