Joie Expanding Beverage Bottle Stopper, Pack of 3, Assorted Colors EASY TO USE  Insert the stopper into the bottle and press the lever to seal the bottle air tight. AIR-TIGHT SEAL  Stopper produces a leak-proof seal to prolong and preserve opened bottles. VERSATILE  Use it to seal mineral water, wine, beer, champagne, vinegar, oil, and more. MATERIALS  The lever is made from plastic and the seal is made from durable rubber. CARE INSTRUCTIONS  Hand washing is recommended to ensure the longevity of the bottle stopper.