Mason brand lids meant for canning are steel and will rust quickly in a saltwater environment. The inside surface is coated and somewhat durable but the outside is pretty weak.
That said there's an entire aftermarket for Mason-style jars, and lots of places online where you can get all-plastic replacement lids that would work just fine.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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