I've been looking around and can't find a good answer to this.
So far I know that in order for it to be effective and painless, it needs to be smooth, sturdy and around 2cm thick, but I don't know anything about rope so I don't know which one to get or which materials are good
If you know the type of rope that should do the trick, please let me know! Bonus points for any extra tips around this topic (eg. height of jump or something idk)
Oh and please refrain from the whole suicide prevention talk, if I wanted to be lectured I would've gone to Quora :)