The Boston Shaker came about in the 1800s on a transatlantic ocean liner on its way to Europe from Boston and it is a tool that characterises the all-important figure of the bartender. It is a wide steel beaker (known as the Mixing Tin) which is placed rim to rim with an upside-down glass (Mixing Glass). The Mixing Glass is often nothing more than a smaller version of the Mixing Tin or even a polycarbonate glass.
The Mixing Tin is often used in the acrobatic performances of what has become known as Flair Bartending. It is available in a wide range of colours, rubber-coated and with a slightly weighted bottom to facilitate the more extreme acrobatic moves.