... .09mm 3)Length:4m 4)Material: Aluminum Flexible Aluminum ventilation duct hose 1)Nominal Diameter:50mm to 500mm 2)Thickness:0.07 ... to 0.09 3)Length:4m 4)Material: AluminumAluminum hose is an ultra-thin aluminum strip, after pressing processed. It ... of exhaust system, device, Can also be used for central air-conditioning of the soft junction, Are free to bend, stretch ...