Producer's Notes: Our flagship Four Grain Bourbon aged over four years to meet the standards of the Bottled in Bond Act of 1897. Bottled in Bond requires that the whiskey be a product of a single season, using the grain of a single season, made by one distiller at a single distillery, and aged at least four years in a federal government-bonded warehouse. This whiskey is then cut and bottled at 100 proof (50% ABV). These rules are even more stringent than the U.S. standards for “Straight Whiskey.”