Shaxon"s ST to ST duplex single mode 8.3/125 fiber optic patch cord is a high quality optic fiber patch cable designed to interface two devices with single mode duplex ST ports. To guarantee superior performance our Fiber Optic cables are individually tested to higher then industry standards. Shaxon Fiber Optic cable feature a rugged zip construction and a kevlar inner strength member for durability. Optical Fiber is a superior cabling option for future proof bandwidth and data speeds and is completely resistance to EMI/RFI interference and allows for much longer cabling runs then copper cables.