Leak-Proof & Air-Tight: the champagne stopper has 4 steel balls inside can clamp the bottleneck & soft silicone fits more in most bottle neck to avoid any air leakage. Keep your champagne fresh for longer. (Note: suitable only for bottleneck shape of traditional sparkling wine bottles with an inner diameter of 17.5-18mm) Easy to Use: use this champagne saver bottle stopper to preserve the leftover bubbly after opening. Adopts a rotating design. Just insert the stopper onto the bottle and rotate the stopper to " LOCK ", rotate to " UNLOCK " to open it. Easy to Storage: the size of this champagne bottle stopper is 1.53"(3.9 cm) * 1.25''(3.1 cm), which is small in size and easy to store. The round champagne stopper shell is made of wear-resistant ABS material, which is easy to clean. The internal seal of the wine bottle stopper is made of food contact grade silicone material, which is safer. Value & Perfect Gift: 3 pack champagne saver bottle stoppers perfect for champagne, cava, prosecco & sparkling wine. As a great gift, goodie bag filler, and stocking stuffer for events, holidays and party.