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This is a black 1000 foot spool of indoor/outdoor rated fiber optic distribution cable intended for long distance runs at high speeds. It is composed of 6 singlemode fibers 9 micron core inside a water blocking Aramid yarn wrapped in a black PVC outer jacket. Single mode fiber is optimized to work with fiber optic equipment using light wave lengths of 1310nm nanometers or 1550nm. The cladding diameter is 125 microns. The core and cladding of our black bulk indoor/outdoor fiber optic cable is constructed using a high quality singlemode fiber that is ITU-T G.657. A1 compliant and backwards compatible with other legacy singlemode fibers. This particular cable is Riser Rated CMR meaning it complies with UL-1666. It is for usage in vertical tray applications without environmental air. Examples being: cable runs between floors through cable risers or in elevator shafts. These cables self extinguish and prevent the flame from traveling up the cable in a vertical burn test. This fiber optic cable is solidly constructed UL rated and RoHS Compliant.