1.Single foil layer 2.Standard lenthe 10m/pc 3.DIA:2''-24'' 4.Extension Rate:1:50 / 1:33 5.Thickness:0.07mm Application:1. For central air-conditioning ventilation ,soft connections, and other ventilation systems.2. Air conditioning and HVAC system, ventilation system, exhaust kitchen oil gas.Properties: ItemMaterialSize(I.D)Note AluminumFoilTube AluminumFoil And Stainless Steel Wire(mm)(Inch)1) ...