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Those look interesting. I'd love to hear a review.

I've never seen a clay bowl with a stem of another material, and I'm unfamiliar with the term "ebonite." A visit to Wikipedia has me thinking it's the same thing as the "Vulcanite" used for briar pipe stems. (These are either vulcanite - hard rubber, or lucite - plastic.) Clay gets much hotter during smoking than briar, so I'd be a little concerned it might melt the tenon. On the other hand, those guys look like they know what they're doing.

I ordered this one:
https://shop.pipeshoppe.com/product/markus-fohr-47/

they've got a combo with this and a 15" but that wouldn't have gotten approval from "purchasing".