The RS PRO 15cm USB version 3.0 A male to Micro B male cable has a white PVC jacket. The cable flex has copper wire conductors and drain wire, with an aluminium braid, foil shielding and has an outer diameter of 5.5mm. The connectors and pins are made from nickel and also have PVC hoods. USB 3 A male to micro B male cables are used to connect a smaller device such as external hard drives to a computer.