... 5mm-25mm chinese good quality of fin tube 1.G fin, L fin, LL fin, I fin, E fin, KL fin2.Available Processing Technic: ... etc. 3.Types of bare tube: Seamless & Welded 4.Material: Carbon steel/Stainless steel/Aluminium/Alloy steel etc. ... &Copper Alloy TubeAlloy Steel MaterialCopper &Copper Alloy TubeMonometallic Fin TubeLow Fin TubeCarbon Steel, stainless steel, titanium, copper, brass, nickel alloy, ...