This is a black bulk 457.2m reel of indoor/outdoor optical fiber distribution line suitable for long distances at high operating speeds.This product consists of 6 singlemode fiber (9 micron core) with a blocking aramid yarn wrapped in a black PVC outer sheath.Single mode fiber optimization work with fiber optic equipment using the light wave length 1310 nm nanometers or 1550 nm.The outer material is 125 microns in diameter.The black part of the core and outer material of the indoor/outdoor fiber optic cables are all adopted using the high quality singlemode fiber itu-t g. 652.D compatible with other traditional singlemode fibers.This cable is Riser Rated (CMR) to ul-1666.This is used to use the vertical pallet application not environmentally friendly air.Examples of hardness between cables through cable floor shaft or elevator shaft.These cables are automatically extinguished to prevent the flame from traveling from the cables in the vertical combustion test.This fiber optic cable is very strong UL grade meets ROHS standard.