How can I protect my credit cards from magnets?
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Filed under: Alternative Medicine
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If you can enclose them in a metal case that might help; Magnetism can not penitrate a metal shell.
Mythbusters did a show about this they tried all sorts of things and found it very difficult to damage the encoded info.
You typically need an alternating magnetic field to damage magnetically encoded information. A magnet in a credit card holder isn’t likely to do it.
Keep your cards away from any magnet.
wrap it with an insulator
I doubt the magnetic card case has a strong enough magnetic field to damage your cards. Typically, it would take a magnet of a several tesla to do any harm. Check the back of cards for scufs and scratches.