Redbreast 27 Year Old Ruby Port Casks is a single pot still Irish whiskey "enriched by" Ruby Port Casks and bottled at a natural cask strength of 53.5% ABV. Redbreast 27 Year Old Ruby Port Casks is a single pot still Irish whiskey "enriched by" Ruby Port Casks and bottled at a natural cask strength of 53.5% ABV.\n \n Redbreast 27 elevates the storied reputation of this iconic whiskey even further. Building on the celebrated foundation of bourbon and sherry cask influence, the inclusion of Ruby Port Casks brings even more complexity and depth. Nearly three decades in the shaping, this cask strength Redbreast is a joy to behold in each every bottle.