The Four Grain whiskey of the KOVAL distillery is an interesting bend of 40% Oats, 40% Malted Barley, 10% Wheat, 10% Rye. All the grains are sourced locally in the Midwest and come from organic farms. The KOVAL four grains, like all their other whiskies is made of a single malt, single distillation, single barrel and are certified organic and kosher. 94 proof. Small Batch. Single Barrel. Unfiltered. Heart cut. Organic.