AIRTIGHT SEAL: This reusable wine bottle stopper is made of flexible, food-grade silicone that forms an airtight seal to keep wine beverages fresh for weeks after opening. UNIVERSAL FIT: The stopper's flexible design fits most traditional wine bottles with a neck diameter between 18-19mm for wine bottles to preserve the aroma and flavors. LEAKPROOF STOPPER: With its ABS plastic construction and silicone sealing ring, this stopper creates a vacuum seal that is leakproof to prevent spills or messes when transporting or storing partially consumed wine. EASY TO USE: Simply insert the stopper into the bottle opening and twist to securely seal. Its simple one-handed operation makes closing bottles effortless for enjoying wine over multiple servings. Lightweight and weighs about 1 ounce. WINE GIFT ACCESSORIES: A great gift for any occasion, events, holiday or party favors -- especially when paired with a bottle of wine.