Cable Matters 16 AWG In-Wall Rated (CL2) Oxygen-Free Bare Copper Bi-Wire Speaker Cable 250 Feet This pro-grade 16 AWG, CM and CL2 rated, biwire speaker wire is an ideal choice for connecting your loud speakers to an AV receiver or amplifier in a 2.1, 5.1, or 7.1 channel home theater system Heavy gauge conductors are made of solid oxygen-free copper as opposed to copper clad aluminum (CCA) or copper clad steel (CCS) to resist corrosion and deliver pristine sound bi-wire speaker cable has durable PVC jacket which complies with the CL2 rating for the fire safety requirements Four conductors are jacketed with color-coded PVC for easy polarity identification for your bi-wiring or bi-amping projects Premium speaker cables wrapped around a plastic spool in the box for easy and convenient installation without kinks