Allstar ALL42154 Black 4" x 10' Brake Duct Hose Brake duct hose measures 4 inch diameter x 10 feet long Hose is flexible, features a non-kink design, and directs air from the front ducts to the spindle ducts Rated at 300 degrees fahrenheit Made from a black 3 inch double-ply neoprene-coated woven fiberglass hose with a spring steel inner and external fiberglass supports Features a smooth inner wall for unrestricted air flow