Jack Daniel's Special Release Twice Barreled American Single Malt - This special release series highlights the Jack Daniel’s Distillery’s innovation. Crafted from 100% malted barley, matured first in new American charred oak barrels and then in the finest Oloroso Sherry casks, we extend this Jack Daniel's Special Release Twice Barreled American Single Malt, a one-of-a-kind craftsmanship to you.