A: I am not sure of it's strength rating, but it is very strong. I work with rare earth neodymium magnets in my stuff I do with my sister and we have been through the magnets. I have found this clasp to be very strong, I might suggest a little catch chain, as I have often found my self getting stuck to the grocery cart when I wear mine, sometimes pulling it off! Karla
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Answer provided by: Karla Schafer (11/20/2014)