Buffalo Trace announced its latest experiment—barrels made with 300-year-old wood.

According to a press release, the 300-year-old Kentucky trees were previously cut and were the oldest oak trees the distillery could find that had already been harvested. Partnering with barrel firm East Bernstadt Company, it took more than a year to procure the 300-year-old wood and then a year of stave seasoning before the barrels were made, the company said.

“It’s a unique opportunity to be able to experiment with a variable that is even older than our Distillery, which is 244 years old,” Master Distiller Harlen Wheatley said in a press release.

The filled barrels entered the warehouse in December.

The distillery has more than 14,000 experimental whiskey barrels aging.

Photo provided by Buffalo Trace