... the United States,Canda, Italy,India and other 16 countries for many years .Low carbon steel tubeDouble wall (cut to length ... .00mm,9.53mm,10.00mm 12mmThickness: 0.71±0.07mm 1.0±0.07mmCoating: copper, white zinc, yellow zinc, PVF,PVDF ... .00mm,9.53mm,10.00mm 12mmThickness: 0.71±0.07mm 1.0±0.07mmCoating: copper, white zinc, yellow zinc, PVF,PVDF ...