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 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 unveils straw to drink 2 shake flavors at once
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