Learn Italian: Le porti tu, le cuffie? - Are you bringing them, the headphones?

This is a structure called "Right Dislocation," which is very common in spoken Italian. The speaker anticipates the object with a pronoun (Le), says the main phrase, and then tags the actual noun (le cuffie) at the end to make sure you know what they are talking about. It feels just like saying "Are you bringing them, the headphones?" in English.

Why is the subject tu placed after the verb (porti tu)?

Putting the subject pronoun after the verb adds emphasis. Instead of just asking "Are you bringing them?", placing tu there shifts the focus to the person, meaning "Are you the one bringing them?" (as opposed to someone else).

Why use Le instead of Li for the pronoun?

The anticipating pronoun must perfectly match the gender and number of the noun it refers to. Because cuffie (headphones) is a feminine plural noun, you must use the feminine plural direct object pronoun Le.

Do I have to write the comma before le cuffie?

Yes, when writing a right-dislocated sentence, the comma is required. It represents the slight pause you naturally make in speech before adding the clarification (le cuffie) to the otherwise grammatically complete sentence (Le porti tu).