This video cable has an 18-ga. copper conductor center.
Standard cable is shielded with foil and aluminum braid.
Quadruple shielded cable has foil, aluminum braid then another layer of foil and aluminum braid. UL class 2 rated. Most cities in the US require in-wall cable to be Class 2 or higher to meet electrical code. If the cable is not UL rated, the cable should only be used outside walls. The lower the gauge, the thicker the wire.