this Rabbit Hole Cavehill Kentucky Straight bourbon whiskey is made from four grains and aged in #3, wood-fired barrels. With a mash bill of 70% corn, 10% malted wheat, 10% honey malted barley, and 10% malted barley, Rabbit Hole's Cavehill is bottled at 47.5% ABV. A four-grain mash promises spice and honey and a fresh apple breeze.