You show a link and a chain. You give them to a spectator to check. Of course there’s nothing suspicious about them…
You ask for it back and magically, in one movement, the link goes through the chain. The audience will never be able to understand how this ingenious trick was done!
The ring and chain are made of steel and can be checked!
It is also lightweight and very easy to transport!
It can also be worn as a regular chain with a pendant!