... 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 & Welded ... 5FPIFin Height Max 16mmHG-Fin Tube (Imbeded Type)Aluminum A1100, A1050, A1060High Frequency Welded Finned TubeCarbon Steel ...