The Rye Cask Finish is aged for 10 years in first-fill American oak, giving it a familiar vanilla smoothness, then finished for a month in rye casks to add a spicy note. It is bottled at 46% ABV, a higher proof than the other marques in the Johnnie Walker portfolio, in order to provide a more distinctive character when used in cocktails. The Select Cask series is chill-filtered, in order to maintain Johnnie Walkers classic texture and mouth-feel." The Whiskey Advocate