"A barrel or cask is a hollow cylindrical container with a bulging center, longer than it is wide. They are traditionally made of wooden staves and ...
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bound by wood or metal hoops.
Modern wooden barrels for wine-making are made of French common oak (Quercus robur) or white oak (Quercus petraea) or from American white oak (Quercus alba) and typically have standard sizes: "Bordeaux type" 225 litres (59 US gal; 49 imp gal), "Burgundy type" 228 litres (60 US gal; 50 imp gal) and "Cognac type" 300 litres (79 US gal; 66 imp gal). Modern barrels and casks can also be made of aluminum, stainless steel, and different types of plastic, such as HDPE." - (en.wikipedia.org 06.10.2019)
