4lb of MJR Tumblers Premium 400/600 Pre-Polish Aluminum Oxide Rock Polishing Grit for Step/Stage 3, MJR Tumblers is a Disabled and Veteran Owned Company Proudly Located in USA

Amazing. I was about to give up because my rocks were just not getting polished very smooth but not polished read the reviews for this product and decided to try it . I'm only on day 4 of polishing with the 12000 grit and my rocks already look amazing. Will 100% be buying again in the future!

Works great to further polish rocks while tumbling

Be patient tumble a long time and you will be amazed how shiny your rocks will be. Just remember that the finished piece is no better than the base underneath the final finish. Like a paint job on your car, if there are rough patches they’ll still be there at the end.

This was a good refill for the final polishing step in my tumbling. I had a beginners kit and used all my polish and i refilled using this. It was a good price and worked as advertised. Obviously you would need all the other steps before getting to this one but it did give my stones a nice finish.

I purchased several other "polishes" for my rock tumbler and none of them got me that wet shiny look the Rocks seem to just get smaller. Now this stuff IS AMAZING!!!!! Not even a full 24 hours with this polish and they are so shiny!!!! I will definitely be buying more!!!

The media could not be loaded. I’ve been ordering every kind of polish on Amazon trying to find another one that works and that isn’t as expensive as the poly plastics but everyone I try never gets me a shine. I have 15 tumblers running. I’ve done this for a long time and make sure everything’s clean I don’t mix different hardnesses. At first, I would eat the cost the last two I returned because I know it’s not me. Other people seem happy but they show their rocks and none of them are shiny.

Best polish gritt I've found so far.

We got some rock tumblers around Christmas and they’ve been running since then. We could never get the polished shine we expected, some of these rocks have been final polished or burnished for weeks without getting them to shine. I decided to give this product a try. It arrived four days ago and I immediately started the problem rocks tumbling in it. I just checked today and they already have a beautiful shine when dry!The grit is pricey, but you cut can cut the cost in half by buying five pounds.