This 1 foot black telephone line phone cord is built with 100% copper conductors for superior signal transmission. Unlike cheap cables that use aluminum, which can lose up to a third of the signal, our pure copper wires ensure a full, uninterrupted connection. The RJ11 plugs feature 50-micron gold contacts, offering the thickest gold plating typically reserved for high-speed Ethernet cables, guaranteeing a durable and reliable connection. The cable is compatible with telephones, FAX machines, answering machines, caller ID devices, call blockers, VoIP systems, DSL modems, 2-line phones, and other telecom devices. It is specifically designed with straight-wired RJ11 connections for both voice and data transmission. Made in the USA, this high-quality cord is precision-engineered in New York with internationally sourced materials. The extra-durable PVC jacket provides added protection, and the flat cable shape ensures flexibility. The conductors are 28 AWG stranded copper. The RJ11 male connectors (6P4C) feature 50-micron gold plating. The cable comes with a lifetime replacement warranty. Included in the package is a 12-inch black RJ11 telephone cord.