Dos Maderas PX 5 + 5 Year Old Rum is made from a combination of rums from Barbados and Guyana. It is unique because of its triple ageing process where for 5 initial years the rum is aged in the Caribbean in oak casks. Next PX 5 + 5 is aged in Spain for 5 years in sherry casks, and lastly for 2 more years in even older sherry casks. The Dos Maderas family of rums are produced by Bodegas Williams & Humbert, which is a well known Spanish winery founded by Sir Alexander Williams in the late 1800s.