"Choking game" demonstration. Where can I find this item? (kind of a neck band)

[Motoko]

I want to get same "neck band" that this girl has on this video. What's this and where can I get it?

Do you know what's that? Does it tighten up when going down or it's fixed? Or how can I make it myself? I want something like this, with full width of band around the neck and some point of attachment (for hook) behind it. Sorry if my explanation is bad.

Attaching video seems to be broken https://www.youtube.com/ watch?v=MHRchAjxUMA (remove space before "watch")

 

[Moose.000]

Images of materials are attached in this post.

https://sanctioned-suicide.net/threads/girls-ligature-from-the-choking-game-video.25833/

 

[Motoko]

Images of materials are attached in this post.

https://sanctioned-suicide.net/threads/girls-ligature-from-the-choking-game-video.25833/

Thanks!