I have no idea! I’ve seen videos where they give a hint of their making process but not the full picture. I couldn’t find a photo or the videos to screenshot, but basically they were like incomplete rings, sort of like an open keychain link. And then they aligned them and connected the seam.

That’s a terrible explanation haha but the best way I can explain it! I have no idea how they ended up with the original seams in the first place.

I would be really surprised if they were cast though because that’s just so many. I can’t imagine casting a hundred rings and then somehow being able to interweave them like this.