Hand Wash - To avoid damaging the copper electroplated coating and shortening the life of the plastisol.
Our factory says they would be good for water bath or pressure canning, but we haven't had them officially tested.
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They look great. If one isn’t sealing a jar, they’re fine. However, I make herbal infusions, which often form a seal. I have to use a bottle-opener to break the seal and aluminum bends. Too bad. I don’t know whether it’ll bend back. Stainless steel would work better for the infusions, I think. No issues with room temp or cold use. I really like them other than the bending issue.