Strong magnets. However, they are colored and the silver color will fade after some use, only on the leather side, hence I give them 4 stars. Also they are really good and durable and I will buy them again. UPDATE: They stick very well to superglue. Today I had to cut a leather cord and had to pull very hard to separate the leather from part of the cap. The magnets never separated while I was wearing the jewelry, so don't worry about losing them. i will buy them again
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