I want to back my to-be pendants with a piece of metal as shown in the photo below:

I went to a bead store and asked if they supply them and she suggested going to a lampwork shop. what do you think?
have also tried an extensive search online but I think my main problem lies in the fact that I don't actually know what these are called!
any suggestions/comments/links to online stores that sell these and ship to australia?
thank you so much for your time!
<3 tali






















