Good evening folks,
perhaps I am being lazy but Google is not my friend tonight.

A friend wants to extend the roof of her horse stable rearwards. Stable is
6 months old. Make unknown.

The corrugated roofing sheets are about 2" pitch x 1.5"depth x 1/4" thick.
Not metal and not clear plastic. Rounded, not folded square edge. Dark
grey/black in colour and quite pliable. Perhaps some kind of fibre or
composite.
Any idea what these might be and a supplier?

Many thanks,
Nick.