I needed a refix on my old Euphonium, and this was the most fitting size for the job. It does close up the holes perfectly and do their job very wel. The cork is of great quality and wil now last for a long time again :)
Good improvement for the stock cork
Kunst Bauer 30.08.2020
I replaced the stock cork of my Thomann FH 600 G Bb-Flugelhorn with these ones. They're a tiny bit big (better than too small), but they do the job better than the stock cork and seal well.
Good quality water key corks
These corks are mushroom shaped which helps as the waterkeys on my cornet are mounted slighty out of alignment with the water drain holes. Them seem firm and well made.