string cheese
US /ˈstrɪŋ ˌtʃiːz/
UK /ˈstrɪŋ ˌtʃiːz/

1.
a type of mozzarella cheese that is made into a cylindrical shape and can be pulled apart into strings
:
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My kids love to eat string cheese as a snack.
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She packed a string cheese and an apple for her lunch.