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prob a synthetic. I would say check with Fedex Kinkos but they are on the wrong side of the gun control debate. Anyway I had a small drawing blown up to that size and it came back on a rubbery canvas-like substance.
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do you plan on working in large format over a long period of time? (i.e. you won't be satisfied with making a smaller original & blowing it up later) I'd use primed canvas or perhaps something like vinyl for durability, mistake fixes, hedge against accidental deformity.