The Balvenie Single Barrel Sherry Cask has been matured exclusively in a single European oak sherry butt for at least 15 years. The term ‘Single Barrel’ conveys the unique nature of the single malt whisky, which has been drawn from a single cask.  No two casks will produce an identical single malt therefor each bottling of the Balvenie Single Barrel forms a unique limited edition with each bottle hand numbered also carrying the number of the cask it was matured in.