Briz Bell Rings are standard on the Briz 2000 style horn. They are optional on the Kruspe style horns. The thread patterns are Alexander style. The ring itself is a unique Briz design. I have been told that the Briz valve ring is not compatible with any other brand of bell ring. Besides making it possible to place the horn in a travel case, the screw bell configuration allows the use of alternate bell flares.
Briz is a very forward looking company and makes special bell flares for their horns with garlands. In Germany they call these things Kranzen or something like that. I never studied German so I could be wrong. While at NAMM I tried out several horns with bells with these garlands. The garlands deepen the tone and seem to stabilize the sound a bit at fortissimo in the higher range. They can be specially ordered. Lead time is about 2-3 months unless they happen to have one on the shelf.