The Adversiting Board at the back of the Bus?

Does any one know what is it made of?
It seems like a kind of plastic corrugated board

Answers:
Its made from Correx, the same as estate agents boards
or somtimes from Fomex as its a bit tougher.
all avalable from

http://www.westwardplastics.co.uk/.
your guess is as good as mine
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