Abstract: A USB cable (100), comprising: a power wire (1) transferring positive power, a pair of signal wires (2), a metallic braided layer (5) enclosing on the power wire and the signal wires, an insulative outer jacket (6) surrounding the metallic braided layer, and three drain wires disposed in the metallic braided layer. The power wire comprises a metallic inner conductor and an insulative layer surrounding the inner conductor, and the insulative layer of the power wire is made of Polypropylene. The three drain wires comprises a pair of first drain wires (31) and a second drain wire (32), and each first drain wire has a larger external dimension than the second drain wire.