Plenum (OFNP) indicates the jacket is coated with flame-retardant, low smoke materials. Commonly used in schools and government facilities. Yellow Singlemode Duplex Corning optical fiber with ceramic LC connectors on one side and SC connectors on the other. Zipcord Duplex fiber is Plenum and is 9/125. The fiber is 2.0 mil thick. All connectors come with clips. Each cable is invidually bagged. Please note: these are custom built and make take 1-2 days to ship.