If you are planning to install audio throughout your home, this is the cable you'll need. Impact Acoustics(?) in-wall speaker wire is made from 65 strands of 99.9% high-purity copper; it is very flexible and unlikely to kink during installation. This cable is CL2 rated for use inside walls. In-wall speaker wire features twisted-pair conductors to make the wire much easier to pull throughout the house than flat or zip-cord style speaker wire. Twisted pairs also help to cancel common-mode noise. Inner conductors are color-coded for easy identification.