Straight Outside Diameter: OD 4" (102mm), Length: 12" (300mm), Wall thickness: 0.071''(1.8mm) | Wrinkle Coated Matt Coarse Surface Treatment. Designed to be cut, spliced or welded to fit custom applications | Fit for air intake, cooling systems, turbo intercooler piping setup | The precise mandrel-bent aluminum tubing keeps air flow uniform, smooth and free-flowing. | Made from high-quality 6061 aluminum alloy, fit for a wide spectrum of custom applications while withstanding high heat and stress.