Each wooden oak barrel mug is hand-made from authentic full size used oak barrels that were used to age, tequila, bourbon, whiskey or scotch. It’s a miniature version of the full size oak barrels used all over the world to age liquor and wine. The barrel mug is just like the one used to age your rum, tequila, whiskey, bourbon, scotch, etc except we have coated the inside with an all natural beeswax to seal it up for your use. There is not a barrel mug on the market more authentic than this one. Black steel hoops just like the barrels used in wineries and distilleries. We will even engrave your initials or image on the outside for you.