I originally bought the 2.4mm and tested it in a salt water solution for two weeks with no sign of rust or corrosion. 2.4mm turned out to be too small for what I wanted to use it for, so I took 4mm as a sample. As it was sold by a different seller I was concerned it wouldn't be of the same quality so I tested it in salt water for over a week and it showed no signs of rust or corrosion either. Both sizes stick to the magnet so I was afraid they would rust but they didn't. Even after soaking in salt water, the chains have a nice shine and look like new. I would buy again.
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