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Years ago I bought a bunch of new balls and put them on the shelf. When I went to use them a few months later there was quite a bit of surface rust on all of them. Since then, I keep them stored submerged in motor oil. It only takes a few minutes to clean them using some lacquer thinner when it's time to change the balls.
Quoted from NC_Pin:On a serious note (sorry) what grade of steel do they use for the balls? I am a metallurgical engineer and now I am kinda curious. I guess I had just assume they were 304l stainless
It's some flavor of carbon steel as stainless would not work well with the magnets. I'm sure there are some posts discussing the various steel options.
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