I bought these magnetic clasps mainly because of the copper. I gather from the description that the number was chosen at random, but the silver clasps (43 out of 100) far outweigh the amount of other metals. I will of course use silver clasps, but it would be nice to have a more even distribution. The magnetism is strong and works well for jewelry. I also bought another batch of magnetic clasps from Revain that didn't contain copper but cost almost half the price for the same amount and were just as strong. When I need more copper fasteners, I look for that specific metal. I will not be buying these clasps again due to the price and color distribution.
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