From The Official Website

This exquisite single malt has been crafted from a combination of unpeated and peated spirit and four cask matured for at least twenty one years in bourbon barrels, sherry casks, virgin oak casks and Bordeaux red wine casks. During long maturation Benriach-s sweet Speyside smoke mellows and integrates with the fruit, malt and oak. After twenty one years, rich layering develops into an elegant honey smoke, enriched through multi-layered cask maturation. The whisky from each cask type, imbued with particular flavour characteristics, is then expertly married together to create a rich and elegant single malt, layered with lush orchard fruit and toasted pine wood with a honey smoke finish. All in perfect balance.