1.Polished; 2.Stainless; 3.Good quality feedback from clients; 4.Stainless steel tubes. The stainless steel materials we use are:Astm 304, Astm304L, Astm321, Astm316, Astm316L The manufacturing standards we use are:Astma269, Astma213, Astma 312, Astma213,Astma511 etc Ranges: Outdiameter: 0.8--274mm, Wall thickness: 0.1--30mm Polished Stainless Steel Tubes