Belkin multimode duplex fiber patch cables are 100% tested for quality and reliability and feature corning glass and superior construction. The fiber cables work in the same types of network deployments as 62.5/125 cables, and are also well suited for horizontal and intra-building deployments. The strengthening fibers that help protect the core against damage during installation or from being crushed. The coating layer of thicker plastic surrounds the cladding and helps protect the fiber core. The layer that protects the core and causes the neccessary reflection to allow light to travel through the fiber-core segment. The physical component that transports the optical data signal, made up of a continuous strand of glass. The core's diameter is measured in microns.