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Looks like OXO makes a fully stainless+silicone version: https://www.amazon.com/gp/product/B07GF4WYGT/

The filter looks a lot coarser on that one though, fwiw

yeah, and perforated metal tea filters are all dramatically worse in my experience. truly awful flow rates, you don't get very good brews.

Thanks for the feedback, you two! Know of any that are all-metal, but not perforated?

You can get them in stainless steel too, e.g. https://www.paperandtea.com/products/p-t-infuser

They're not even difficult to buy. In the UK most supermarkets will stock at least one variety where the bag is fully biodegradable. Sainsbury's, Aldi, Waitrose own brands are too I believe.