External fuel tanks are manufactured to suit specific needs, predominantly these comprise a centre section made up of 5-axis machined frames and external formed aluminium skins, conventionally or automatically riveted. Forward and Aft Nose and Tail Sections are constructed similarly or can incorporate carbon composite skins. GE manufacture External Fuel Tanks for Harrier, the Conformal Fuel Tank for Hawk and the Supersonic Fuel Tank for Eurofighter.