Aluminium alloy tube section 1.Material :6061-T6 2.Out ... .8mm 3.Thickness :1.8mm 4.Weight:0.46kg/m Aluminium bicycle tubes section1.Material : 6061/6063 recommended. Other 6000series ... :Extrude machine:4 sets, 500T,650T,800T,1650T,the largest circle size is 160mmCutting machine:5sets, 3set ordinary, 2sets CNC , ... rest assured that your design would be keep confidential . Aluminium bicycle tubes section