Abstract: The invention relates to a method for producing a Y-shaped muselet for bottles of effervescent drinks, said muselet comprising a cage co-operating with a rim, the cage being formed by a first (1) and a second (2) wire and the muselet by a third wire.

Abstract: The invention concerns a wire-cap capsule (1) intended to be interposed between a wire-cap (2) and a stopper intended to plug a neck of a bottle containing an effervescent liquid, said capsule comprising three grooves (10, 11, 12) provided on a first face to each accommodate a portion of a leg (20, 21, 22) of the wire-cap, said grooves meeting at the centre of the capsule to form a Y, characterised in that the capsule (1) is rigid, non-metallic, obtained by moulding and/or recyclable and optionally decorated. The capsule according to one preferred embodiment allows the cage of the wire-cap to be held by force by fastening at lugs (13). The invention also relates to a closure system comprising said capsule.