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 6061,6063,6060,60052.Surface treatment:anodizeding,electrophoresis,power coated.3.Heat treatment: T4,T5,T64.Application:widely used in construction5.The best quanlity and price is just for you