This is an offcut from the clear, soft plastic you can buy in hardware stores off the roll. It's been folded up, and has seen a little bit of use and cleaning so the finish isn't pristine, but I think it could be polished back to that if needed.
Cut from a meter square, so the longest bits are 1 meter and the width is from 25-35cm approx.
It'd be great to hear from you if you have a use for this; will happily post through a close-by letterbox if that's easiest.