If you are planning to install audio throughout your house this is the cable you ll need. Impact Acoustics in-wall speaker wire is made from 65 strands of 99.9% high-purity copper so it s very flexible and less likely to kink during installation. This cable is CL2 rated for use inside walls and features a flame-retardant jacket that helps to diminish the potential of fire spreading between floors. In-wall speaker wire features conductors twisted upon each other that makes the cable round and much easier to pull throughout the house than flat or zip-cord style speaker wire. Inner conductors are color-coded for easy identification. Features: 65 strands per conductor. 99.9% high-purity copper. Color-coded conductors for easy identification. Flame-retardant white PVC jacket. UL listed. CL2 rated for in-wall installation.