The Iron Smoke Casket Strength Straight Bourbon Whiskey is a limited release of their unfiltered, uncut, small batch bourbon. This is of very limited quantity in which its bottled as a rare and exceptionally complex 120 proof. The result is an offering that's picked from thousands of their triple char virgin white oak barrels. Casket Strength means that it has no liquid filler from any other source excerpting delicious notes of butterscotch, vanilla and caramel.