Private investors were invited to purchase entire casks of the stuff long before it was bottled. What resulted is the longest aged Bushmills whiskey available. It has matured very well. Each cask was bottled unfiltered and taken down to 43% abv, with the label bearing the name of the cask owner, or whatever else they wanted to put on it... The whiskey was never intended to be released for general sale. Each cask will differ slightly in terms of flavour but the general consensus is that they are very good whiskeys. There is no age statement on the bottles, but they're just about all 24 years old.