Mishimoto 4 Inch Feet MMHOSE-D4 Heat Resistant Silicone Ducting, 4" x 12' Universal silicone ducting for cool air Diameter: 4" Length: 12' Silicone construction for improved heat resistance Cool vital locations such as the brakes, air intake, or even the driving compartment of race vehicles Mishimoto Lifetime Warranty Material: silicone Length: 12 inch Diameter: 4 inch