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.
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