All I can say is WOW does it work GOOD! I ran some once fired brass thru for 3 hours it looks better than new, inside and out and primer pockets. Then I found the worst looking brass I have, it has sat in my garage for 20 years and was very tarnished, I ran it for 4 hours and they look like new
I got the media from STM but I cheaped out and got the tumbler at Harbor Freight
5 Acres on the east side of the Coburg hills in Oregon.
I have Two Dogs, but my 10mm is for protection