Weller is a brand of bourbon whiskey produced in the United States, specifically in Kentucky. It is known for its smooth flavor and rich history, being part of the Buffalo Trace Distillery portfolio. Weller bourbons are made using a wheated mash bill, which replaces the traditional rye grain with wheat, resulting in a softer taste profile. The most popular expressions of Weller include Weller Special Reserve, Weller Antique 107, and Weller 12 Year. These bourbons have gained a loyal following among whiskey enthusiasts and collectors, often sought after for their quality and limited availability.