These are generic no-name tubes, but look like copies of Loop Bottle Tubes, which seem to be discontinued.
But originals and copies can still be found online a few places. Korsholm has some short ones in their webshop and Fisknu.dk seems to have them in 16mm (in Danish).
Hope this helps.
Can you suggest where to get these tubes? I was in Denmark this summer but Korsholm in Skjern did not have any 16mm. Thanks
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