This is a aqua bulk 1000 foot spool of Zipcord fiber optic cable intended for large installations where you are completing the terminations. It is a multimode fiber (50 micron core) designed to transmit data across shorter distances at 10 Gigabit speeds. Multimode fiber is optimized to work with fiber optic equipment using light wave lengths of 850nm (nanometers) or 1300nm. The cord is duplex (two fibers) which means it permits synchronous communication between devices. The cladding diameter is 125 microns. The Graded-Step core and cladding of our aqua bulk 50/125 fiber optic cable is constructed using a high quality multimode fiber that is compliant with TIA/EIA 455-220A and IEC 60793-1-49. It also maintains compliance with legacy and LED based systems per TIA/EIA 455-204 and IEC 607-1-41. 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.