Maker's Mark® Private Selection is a first-of-its-kind barrel program. It allows our retail or restaurant partners to purchase a barrel and explore their own taste visions of Maker's Mark® – much in the way our past-and-present Maker's® distillers defined theirs. Find your favorite by trying unique expressions of Maker's Mark® Private Selection at your favorite establishments. Each barrel is specially fitted with 10 wood-finishing staves in our limestone cellar and aged for an additional 9 weeks. As single-barrel bourbons, all expressions of Maker's Mark Private Selection® are bottled at cask strength – which ranges from 107-114 proof.