Marker's Mark is a brand of American straight bourbon whisky produced by the Marker's Mark Distillery, Inc. in Loretto, Kentucky. It is aged for at least six years and is known for its distinctive square bottle and red wax seal. The whisky is made from a mash of corn, rye, and malted barley, and is aged in charred oak barrels. It has a smooth, rich flavor with notes of caramel, vanilla, and oak. Marker's Mark is often enjoyed neat or on the rocks, and is also a popular choice for cocktails.