... Technic: High-frequency welding/Extruded/L-foot etc. 3.Types of bare tube: Seamless & Welded 4.Material: Carbon steel/ ... PRODUCTDESCRIPTIONTUBE MATERIALFIN MATERIALTUBE SIZEFIN SIZEHigh Finned TubeExtruded Fin TubeAll Kind of Material can be appliedAluminum A1050, A606115.88~50.87~ ... TubeLow Fin TubeCarbon Steel, stainless steel, titanium, copper, brass, nickel alloy, etc.--9.52~4012,16,19 28 FPI, etc ...