Knob Creek 21 Year is a limited-edition, ultra-aged Kentucky Straight Bourbon Whiskey from the Jim Beam Distillery, bottled at 100 proof (50% ABV). It's known for its rich profile of deep charred oak, vanilla, and caramel, balanced with notes of dried fruit, baking spice, and a long, warming finish. This release is highly sought after by collectors and enthusiasts who appreciate mature, oak-influenced bourbons.