The air cork is just a simple and ingenious device to keep your opened wine bottle sealed air-tight to the last of its days. Simply insert the uninflated balloon inside the bottle and inflate via the pump at the other end (manufacturer even kindly made the pump look like grapes; a tasty touch).
The air cork protects the wine for oxidation for about three days. Fits standard-sized bottles; made from medical-grade latex. Will not alter or affect the taste of wine. Visit the website to read reviews.