The same (carbon fiber reinforced plastic) material the new Boeing 777 wings, some space craft, F1 racing car bodies etc. are built of.
There is a quite impressive also video somewhere on Youtube of pressure test of a carbon fiber/epoxy winded fuel tank for Elon Musk's Space X project rocket.
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There is a quite impressive also video somewhere on Youtube of pressure test of a carbon fiber/epoxy winded fuel tank for Elon Musk's Space X project rocket.