Aluminium alloy tube section 1.Material :6061-T6 2.Out diameter:31. ... coated:Any color once you provide Panton color No. , for example RAL 9001Other:Painting, polishing, brushing,sand blasting4.Price: ... finish, different length , the longest length is 7m for mill finish6.Packing terms:Different finish ,different packing method ... design would be keep confidential . Aluminium bicycle tubes section