This box which Hansel posted shows how some Peltier bananas can have ridges. And I guess I even see some thin vanes. But as thin as yours? (Also, it's tricky to call them "bananas" anymore when they have distinct vanes, but if they're known Pelts and definitely part of a banana run, then I guess they slide under the wire.)
(I'm still thinking foreign on yours, and not "banana".)