If I remember correctly, they are ferrite magnets. The bond is weaker than their original magnet which I don't like, but in any case, they are not supposed to rust. You can confirm with Roger from Tunze.
The wet side and dry side magnets are the same with Tunze pumps. They are all very well sealed. At least they are on my 6105’s, 6205’s and 6095’s. Running them off an overflow should be no problem.
Tunze has a forum in the vendor section here at Reef Central. You can post your question there too but I would suggest including the model Tunze you are talking about.
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