Rabbit Hole Heigold Single Barrel Cask Strength is a limited edition high-rye bourbon made at Rabbit Hole Distillery in Louisville, Kentucky. It uses a mash bill of 70% corn, 25% malted German rye and 5% malted barley, aged in #3 char toasted and charred American oak barrels. The single barrel expressions are bottled at varying cask strengths, with examples at 55.4% ABV and feature special artist-designed labels.