Carries the Highest Fire Rating for Installation Speaker Wire RapcoHorizon CM-12/2.K Bulk Install Speaker Wire is the professional's choice for in-wall installation. Since it carries the industry's highest CM fire rating, you'll find it perfect for even the most demanding applications. From complex studio harnessing to building installations, RapcoHorizon CM-12/2.K Bulk Install Speaker Wire ensures that everything runs smoothly. Here at GearNuts, we feel confident that this cable will live up to its lofty expectations. Note: This is bulk cable only. Connectors sold separately.RapcoHorizon CM-12/2.K Bulk Install Speaker Wire Features: Unshielded Audio Cable Given a CM fire rating for installation safety Twisted pair conductors Wire Gauge: 12 AWG Conductor Material: BC (Bare Copper) Outside Diameter: 0.375 inches Outer Jacket Material: PVC (Polyvinyl Chloride)