Professional Copper and Copper-Alloy Seamless Condenser and Heat Exchanger Tubes with Integral Fins. Finned tubes:1) Integral Low Finned TubesIncrease surface area of tubes, Improves efficiency of heat exchangers and more compact size. Inner Fin, Outer Fin or both Inner and Outer Fin are available.Tube Materials: Copper, Aluminum Brass, Copper Nickel and other Copper Alloy.Fin Pitch: 19 to 26 Fin ...