I'm no expert so can't say for sure, but these rusted almost as quickly as regular nibs. I live by the sea, so live in a harsher region than most, but that's why I chose stainless steel. Plus, the magnet sticks to them just as well as their stainless steel counterparts. I understand that high quality stainless steel (or even non-junk stainless steel) has little if any attraction to a magnet.
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