Whisky Johnnie Walker Select Casks Rye Cask Finish. Johnnie Walker Select Casks Rye Cask Finish is a Scotch Whisky blend that showcases the best of Scottish blending and maturation expertise. With Cardhu single malt at the heart of the blend, Johnnie Walker’s Master Blender Jim Beveridge used whiskies matured for at least ten years in first-fill American Oak casks to create this blend.  He finished the Scotch in ex-rye whisky casks, creating a complex new whisky with rich layers of flavor starting with creamy vanilla notes and transitioning to a spicier finish.