Black - 16/4 Awg CL2 Rated In-Wall Speaker Wire/Cable - 100ft - Indoor - Premium Home Audio 16/4 100ft Black CL2 Speaker Wire/Cable In-Wall Rated - Quality 99.99% oxygen free copper No-Kink Professional Grade Jacket Flexible 65 Strand Count compared to "average grade" 26 strand 16awg UL Listed - 7.3mm OD (overall diameter)