Best dry media STG final polish tumbler

Hello

I have a Raytech vibrating Tumble Vibe and I want to get some dry
mediafor final polishing of sterling silver and brass medium size
rings etc. What kind do you think is the best and should I put some
polish compound with it.The items are finished reasonably well in the
cones then the shot but I want to takeit that little bit brighter
without having to rouge it. And I’d prefer a dry media so thebrass
doesn’t go off colour from the water.

thanks
Phil W