... good quality of fin tube 1.Bare tube size: OD25mm-OD160mm 2.Fins Pitch: 4mm-30mm 3.Fins Height: 5mm-25mm chinese good quality of fin ... tube 1.G fin, L fin, LL fin, I fin, E fin, KL fin2. ... Alloy TubeAlloy Steel MaterialCopper &Copper Alloy TubeMonometallic Fin TubeLow Fin TubeCarbon Steel, stainless steel, titanium, copper ... ~9FPI chinese good quality of fin tube