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 even charred on the inside (just like the one used to age your rum, tequila, whiskey, bourbon, scotch, etc) with a water proof finish of beeswax on the inside. 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.