1.Leak-Proof & Air-Tight: these Champagne & Wine Stoppers set have 4 steel balls inside can clamp the bottleneck & Soft silicone fits more in most bottle neck to avoid any air leakage. Keeps your champagne and wine fresh for longer. (Note: Champagne stopper suitable only for bottleneck shape of traditional sparkling wine bottles with an inner diameter of 17.5-18mm. Wine stopper suitable only for wine bottles with an inner diameter of 18-19mm.)2.Easy to Use: use these champagne saver bottle stopper set to preserve the leftover bubbly after opening. Adopts a rotating design. 3.Easy to Storage: the dimensions of these champagne cork sets are 1.53" (3.9cm) * 1.59" (4cm), 1.53" (3.9cm) * 1.3" (3.3cm), which are small in size and easy to store. The seal set shell is made of wear-resistant ABS material, which are easy to clean. The internal seal of the wine bottle stopper is made of food contact grade silicone material, which is safer.4.Value & Perfect Gift: Wine stopper Set Perfect for Wine, Champagne, Cava, Prosecco & Sparkling Wine. AS a great gift, goodie bag filler, and stocking stuffer for events, holidays and party.