C2G/Cables to Go 43133 12/2 CL2 In Wall Speaker Wire (500 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: 65/0.254 +/- 0.004mm BC Inner Conductor: 65/0.254 +/- 0.004mm BC Inner Diameter: 2.36mm Insulation: 0.32mm SR-PVC