Who has the answer to my bit question?

[StellaArtois]

Hi everyone I am looking for someting similar to the bit I use jumping for dressage any ideas.
I ride my mare in a D - ring jointed (no link)copper roller and she goes really nicely in it. Not sure if its the metal etc.

Which bits would be similar to this one but dressage legal.?

 

[Annagain]

Just a normal D ring jointed snaffle? I'm almost certain (correct me someone if i'm wrong) that any metal is dressage legal as long as the mouth piece is only made of one material so you might be able to find a copper version of it if you think it's the metal she likes.