1000"" IN-WALL SPEAKER WIRE 43109. 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 than flat or zip-cord style speaker wire to pull throughout the house. Inner conductors are color-coded for easy identification