CHICAGO -- McDonald's has just unveiled its latest product, but you can't eat it.
A new advertising campaign is promoting a straw that lets you sip two flavors of a shake at once.
McDonald's said a whole team of engineers designed the new straw. It was created for a new flavor of the shamrock shake - which has a layer of chocolate on the bottom and mint on the top, so you need "the straw" to taste both flavors.
"The straw" debuted on Facebook Live Wednesday.
McDonald's new straw lets you drink two shake flavors at once
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