C2G/Cables to Go 43081 16/4 CL2 In Wall Speaker Wire (250 Feet, White) This is the right cable to install audio throughout your house. Made from 65 strands of 99.9% high-purity copper, this speaker wire is very flexible and less likely to kink during installation. Inner Conductor: 65/0.16 +/- 0.004mm BC Inner Conductor: 65/0.16 +/- 0.004mm BC Inner Diameter: 1.49mm Insulation: 0.31mm SR-PVC