This is a “Remix” of the original Flexi Rex. It's made with stronger links and smaller so that it can be used as a keychain.

To make the links stronger i had to remake the whole model from scratch. It is pretty solid and does not break under normal use, unless you compress it hard while twisted.

The key is removable so that you can detach it faster from your keys if you want to show it off and a fun unintentional feature is that you can catch it on the lip of a glass with it's teeth :)).