Air Cork Wine Preserver Air Cork wine preserver; includes Air Cork device, storage pouch and instructions To use, lower balloon into bottle, pump and watch the balloon create an air tight seal from inside the bottle Protects wine from oxidation for about 3 days; balloon will not negatively alter or affect taste of wine Designed for standard size bottles only; for use in 750-ml size bottle Now shipping with new formulated heat sensitive medical grade latex balloons. These balloons relax within the bottle providing greater durability. Keep valve button depressed while removing the balloon from the bottle. A rinse in warm / hot water will "shrink" the balloon back to near original size. Now ready to its next use or to stored in its storage bag. Balloons should last 80+ uses and are easily replaceable.