White ball in my can of Beamish?

The white object you found in your can of Beamish is called a ‘widget’ and this has been purposely placed in each can of Beamish during production. The widget contains the nitrogen gas required to create the draught flow effect when the cans are opened.

It is present in order to facilitate the production of a ‘head’ for stouts that are poured from a can. In other words it gives the stout its creamy white head when the can is opened.This widget is found in all draught cans of stout e.g. Beamish, Murphy’s and Guinness stout.