Monoprice Plenum Speaker Wire is designed to meet the most stringent standards of safety for both residential and commercial applications. The fireretardant cable jacket has been tested by Underwriters Laboratories and bears the CMP plenum air space safety rating; making it ideal for use in any situation. Available in a variety of lengths and gauges; you can choose twoconductor versions; for connecting a single speaker; or fourconductor versions for connecting speaker pairs. The 100% pure oxygenfree copper conductors are sheathed in colorcoded jackets contained with the main CMPrated jacket. Monoprice Plenum Speaker Wire series is the ultimate speaker wire for commercial and residential installations. UL Plenum Rated 100% Pure Bare Copper Various Lengths and Gauges 2 or 4 ColorCoded Conductors Soft and Flexible Cable Jacket UL Plenum Rated: Monoprice Plenum Speaker Wire uses an external cable jacket; which has been specially treated to resist the spread of fire. It has been CMP rated by Underwriters Laboratories UL as safe for use in the plenum ducts and airspaces of commercial class buildings; making it the ideal speaker wire choice for any situation. 100% Pure Bare Copper: Featuring 100% pure; bare; oxygenfree copper conductors; these speaker wires faithfully and accurately reproduce music with total sonic clarity. Various Lengths and Gauges: Available in 12; 14; 16; and 18 AWG sizes; and in 50; 100; 250; and 500 foot lengths; Monoprice has the speaker wire that is perfect for your needs. 2 or 4 ColorCoded Conductors: Connect a single speaker using the 2conductor wire or connect a stereo pair using the 4conductor variant. Each version has uniquely colored inner jackets so you can easily match polarity at each end. Soft and Flexible Cable Jacket: While most plenum rated cables are stiff; Monoprice Plenum Speaker Wire uses a specially treated jacket; which keeps it as soft and flexible as ordinary speaker cabl