The cooper & aluminum radiator in our product, interior is the copper pipe exterior is the aluminum, over the aluminum radiator this Model have the following advantage, first Corrosion resistant: It is resistant to acid, alkaline and oxygen because of the copper pipes. It is can last up to 30 years. Secondly, the Excellent heat conductor: Because copper and aluminum are better heat conductors than iron and steel, this kind of radiator has higher heat effiency. Third:Stand higher pressure: It can stand higher pressure, therefore, it is suitable for high-rise buildings. Fourth: Elegant design: Original designs are available. Finally, easy instanllation: Light in weight and easy to install. It is suitable in needs the long time heating, for example: The factory, Unit, Offices building heating supply!