Fits All Standard Bottle Necks: Champagne cork suitable for opened wine in all kinds of standard bottle sizes, such as prosecco, cava, red and white wine, champagne, and sparkling wine. Keeps Wine Fresh Longer: The wine stopper clamps tightly to the bottle of opened wine to better maintain flavor and bubbles, keeping wine tasting fresh for up to 10 days. 100% Seal Protection: Our champagne stoppers use the principle of silicone elasticity, effectively blocking the convection between the air inside the bottle and the air outside the bottle. Easy to Use: Just insert the cork stopper into the bottleneck, then secure with the stainless steel clip. Safe Material: Wine stoppers are made of food-grade stainless steel (SUS304) and silicone, with smooth edges that won't hurt your fingers.