Welded coil from Super Radiator Coils ia offered in a range of surface patterns, including flat, sine wave, notched, corrugated and embossed. Tubes are available in 3/8, 1/5, 5/8, 7/8 and 1" dia. and made from AL-6XN, Duplex 2205, cupro nickel, Hastelloy, chrome-moly, carbon steel and 316L.