These Duplex 50/125um Multimode Fiber Optic Patchcords are terminated with ST connectors on both ends. The connectors have durable and reliable polished ceramic ferrules, not composite ferrules often used in low-cost assemblies. The connector ferrules have a precision machine polish that ensures consistent, reliable performance. Maximum loss is 0.4dB and back reflection is -25dB. This product is guaranteed to meet or exceed industry standards. In addition to this patchcord style, we stock many other patchcords for a wide range of applications. You can order patchcords terminated with any combination of ST, SC, FC, LC, MT-RJ and VF-45 fiber optic connectors. We can provide custom cable assemblies in various lengths, pre-terminated with connectors of your choice. We also offer related products and accessories including fiber optic cleaning supplies, inspection microscopes, cable management systems and more. If you don't see an item that you need on this website, just call us and we can get it for you.