I got it with the battery, so I’m not sure. Would be a better question for @TZDKB, but I’m not sure he’d know.
If I had to guess from how it felt to cut, it’s PETG. The black “gasket” is TPU.
I’ve found PETG works really well for enclosures like this. It’s what I used for the second version of Tynee Curse’s enclosure, which is still going strong.