Agraffe

Cage, Agraffe Or Muselet?

The word  agraffe, is defined as being “the wire cage that keeps the cork in a bottle of champagne.” I’d heard the word muselet used before, usually in connection with champagne, but many brewers today also use them, though most people I know refer to them more simply as a “cage,” as in a “cage and cork,” or occasionally a “cage and crown.”
Literally means “staple” (as in Swingline); in Champagne, this is a large metal clip used to secure the cork before capsules were invented, typically during the second fermentation and aging in bottle. A bottle secured with this clip is said to be agrafé.
Cage is what most westerners use; agraffe (once with one f) is more for caged beers; muselet is what the Cage is called.

“Mew sue lay” is not common, but is correct for wired cage of a sparkling wine bottle.