Mary Dowling Whiskey Co Double Oak Cask Strength bourbon boasts bolder flavors and higher proofs, while retaining an incredibly smooth bourbon finish. As a consequence of resting in two different oak barrels from Kelvin Cooperage Mary Dowling Double Oak is aged in #4 wood-fired, toasted and charred American Oak before final resting in #1 new American Oak with a #1 char, and heavy toasting the bourbon benefits from a longer maturing process, creating a deeper, richer taste. Varying ABV