The Balvenie Tun 1509 Batch 7 was made though carefully selecting 21 of the finest oak casks, 10 Sherry butts, 4 ex-American barrels and 7 hogsheads. Totalling 42 of the rarest and most precious casks of The Balvenie. The casks are married together is Tun 1509 a large oak marrying vessel that is maintained by the Coopers of The Balvenie. Using only The Balvenie's rarest casks, this Single Malt Scotch Whisky is truly unique.