The Clef du Vin Pocket Wine Aging Element replicates the wine aging process in the glass at approximately one year per second of use. Simply place the tip of the Clef du Vin Wine Aging Element into a wine glass for an interval of 1-2 seconds. The wine will quickly mature through the natural aging curve. Experience the perfect wine taste in seconds! The Clef du Vin Wine Aging Element is effective only in wines with aging potential. The Clef du Vin can make the taste of harsh, young vintages become softer and more subtle. Clef du Vin Wine Aging Element - Pocket Model comes in a gusseted black leather pouch with magnetic closure and instructions. Tested by scientists and sommeliers in France for more than 10 years before being introduced in the U.S. Made in France.