Retain freshness of bottled juice, oil and wine by creating an airtight, leakproof seal.Set of two transparent bottle stoppers- varied colorsFlanged design fits a wide variety of bottle sizesEasy lock level makes opening and closing easyNot recommeneded for use with carbonated beverages Zyliss has improved its old version of the bottle stopper. Airtight seal keeps freshness in and air out of wine, beverages, oil and vinegar bottles. Lever clicks closed to securely lock stopper onto bottle. Wide flange design fits bottles of various sizes. This bottle stopper is best for non-carbonated beverages