... 4mm-30mm 3.Fins Height: 5mm-25mm chinese good quality of fin tube 1.G fin, L fin, LL fin, I fin ... , KL fin2.Available Processing Technic: High-frequency welding/Extruded/L-foot etc. 3.Types of bare tube: Seamless & Welded 4.Material: ... TubeStainless Steel TubeAlloy Steel MaterialAlloy Steel MaterialIntegral Copper & Copper Alloy High Finned TubeC12200, C11000, C70600C12200, C11000, C7060015.88~22.235~ ...