The fabric was flax, and they only built two Spitfire fuselages with what was called Aerolite, no wings. They did fit a number of Beaufighters in the Middle and Far East with Aerolite panels aft of the wing spar. The rear fuselage of a Magister and 30 Magister tailplanes were constructed, also the main spar of a Blenheim for test, which failed at 80% load.