The post was actually changed, the question was previously simply phrased: 'Made of?' 40 points to Gryffindor!
What would have been cool would be a QR rear axle with a captive spacers and caliper. Done to a few race bikes like this. Makes rear tyre change a breeze.
To put your mind at ease, just carbon fibre with a suitably high temperature resin. Nothing more required, really.