Tamdhu Cuatro Reserva 12 Year Old has been matured in four hand selected, charismatic sherry cask styles for 12 cool, calm years. A one-of-a-kind single malt. European oak and American oak. First-fill and refill. Cuatro Reserva celebrates the character of our wonderfully distinctive sherry oak casks. This is a perfectly balanced single malt for Sherry Wood Connoisseurs.