The best aged White American Oak staves from the Ozarks in Missouri at the Independent Stave Company. We selected a cooperage to assemble our barrels in Louisville, Kentucky that has 55 years of time-tested coopering techniques. All Three Chord Bourbons are aged in Number 4 Char (Alligator) barrels.Water through reverse osmosis, one-micron filter that creates the cleanest, purest water possible.The longer whiskey ages, the more the wood takes over the flavor profile.