nostr:npub1rwast7q4z8skpycsz8epd3jyvgjxhe0uf7ljf93sxvg9qtk9x4vqhyger6

I also took a look at the flag my mom bought years ago. It is something like this one

https://www.valleyforgeflag.com/prod-466-1-24-344/perma-nyl-3-x5-nylon-u-s-flag.htm

All nylon. It has lasted for years now (maybe decades - hard to say).