It is composed of 6 multimode fibers (50 micron core) inside an Aramid yarn wrapped in a aqua PVC outer jacket. Multimode fiber is optimized to work with fiber optic equipment using light wave lengths of 850nm (nanometers) or 1300nm. OM4 increases the available bandwidth from 2,500 megahertz to 4,700 megahertz which in turn increases the maximum distance of 10 Gigabit runs from 300 meters to 550 meters The cladding diameter is 125 microns