The Guinness widget is a tiny, plastic ball inside beer cans. Once opened, the widget's nitrogenated beer squirts into the rest of the beer giving it a velvety texture. How the Guinness widget worksA widget is a hollow, spherical piece of food-grade plastic with a tiny hole in it, Guinness representatives told Insider over email. Nitrogen bubbles are smaller than CO2 bubbles, so the resulting head and taste is smoother and more delicate. That's where Guinness' widget comes into play, because of how it's able to slowly release nitrogen into the beer upon opening.

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