While Amburana is a commonly harvested tree in South America, this was a new find for a craft distilled spirits producer like us. Amburana is known as Brazilian Oak and often used in South America for making essential oils, crafting luxury furniture and barrel aging Brazil's most popular spirit, Cachaça. Our partner cooperage uses a patented technique to honeycomb drill small holes into the Amburana staves, allowing more wood surface interaction with the Bourbon. After aging RD1 Kentucky Straight Bourbon for 4+ years, we insert the Amburana staves into the barrel. It doesn't take long for Amburana's character to beautifully influence the bourbon. The end result represents RD1's curiosity to learn, experience, explore.