1.High quality D tube or flattened tube with aluminum plate adopted, heat conduction good 2.good resistance to corrosion 1 ... .High quality D tube or flattened tube with aluminum plate adopted, heat conduction good 2.professional surface treatment, good ... -pleasing appearance4.internal brightness good, fit for R134a, R600a, etc.5.adhesive tube plate series, riveted tube plate series, etc. available