Folks have loved their beer for millennia, from Thomas Jefferson to Homer Simpson. Plato noted, He was a wise man who invented beer. Originally made of wood, metal kegs increase the safety and shelf life of the elixir within. There is no standard size for a keg, but the US legally defines it as 31 gallons. Cheers. Each figural glass ornament produced by Old World Christmas is hand crafted in age-old tradition using the same techniques that originated in the 1800's. Molten glass is mouth-blown into finely carved molds made exclusively for Old World Christmas, before a hot solution of liquid silver is poured inside. The ornaments are then hand-painted and glittered in a series of labor-intensive steps to achieve the beautiful creations. 3.5 inches.