Its distinct and unique taste comes from refining "mellowing" the freshly distilled whiskey drop by drop through 10 feet of sugar maple charcoal. The distilled whiskey is then matured in American Oak barrels hand-made by Jack Daniel's themselves for a minimum of four plus years and is bottled one barrel at a time as a single individual expression. The only major distiller in the world to make their own barrels. Interesting fact - every drop of the world's biggest selling whiskey comes from a single source, Lynchburg, Tennessee. Each single barrel expression can vary in flavour profile from soft spice to full bodied and robust. Best enjoyed neat or chilled over ice.