Aluminum tube 1.Materials:6000 series such as 6061,6063,6060,6005 2.Surface treatment:anodizeding,electrophoresis,power coated Round Aluminum Alloy Tube ... with Inner Fins1.Materials:6000 series such as 6061,6063 ... .The best quanlity and price is just for you Round Aluminum Alloy Tube with Inner Fins