This Champagne Bottle Resealer is spring loaded with a rubber stopper that seals tightly. The hinged wings then lock over the rim on the neck of the bottle to keep the stopper in place. Keeps the bubbles in your champagne and sparkling wine from fading away Spring loaded chip with rubber stopper seals tightly Hinged wings lock over the rim on the neck of the bottle and work to keep it in place Secure and will not pop out like a rubber stopper