Raceworks 620 Series Black Aluminium Hard Line is extruded from lightweight, seamless aluminium tube. It is available in four different sizes, and we recommend using a tube bender, to minimise flaking of the black coating on the bends. Should this happen, it has no effect on the integrity and corrosion resistance of the aluminium line. RWH-620-05 RWH-620-06 RWH-620-08 RWH-620-10 Wall Thickness of 1mm. Roll Length 7 Metres.Ethanol and Methanol Safe.