supermagnetman magnets

Feralisti

https://supermagnetman.com/pages/custom-magnet-request came across these things, if i order teflon/ptfe coated magnet how bio proof would it be? and they offer n55 grade magnets too, but i  cant find any specs for that grade of magnets are they better for field sensing than n52? thanks in advance!:)

Meanderpaul

Do a search in the forums this is already discussed to death