... quality of fin tube 1.G fin, L fin, LL fin, I fin, E fin, KL fin2.Available Processing Technic: High ... -frequency welding/Extruded/L-foot etc. 3.Types of bare tube: Seamless ... MaterialAlloy Steel MaterialIntegral Copper & Copper Alloy High Finned TubeC12200, C11000, C70600C12200, C11000, ... TubeCorrugated TubeAll Kind of Material--6.35~402~9FPI chinese good quality of fin tube