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https://www.supermagnete.de/eng/disc-magnets-neodymium/disc-magnet-diameter-5mm-height-5mm-neodymium-n45-teflon-coated_S-05-05-T here is the link, im not implanting them nor do i have any but i was thinking if someone else is looking for "decent" implant magnet. they are only n45 but should be enough for sensing, the big pro whit these is the teflon coating, it will last a decade. tomorrow i will starts trying to coat magnets by powdering hdpe plastic and heating the magnet to high temperatures then sprinkle the hdpe powder on the magnet, i also have started buiding a remagnetizer to restore the hdpe coated magnets.