As other reviewers have said these bearings will rust in your paint bottles. Luckily I only put them together in a few colors and never bothered to include them in my entire collection out of sheer laziness. I noticed discoloration at the bottom of one of the bottles so I pulled out the bearings and found that out of the 5 colors I had time to apply the bearings 4 were rusty and 1 was not. Not a very good chance if you need them to mix colors. look elsewhere
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