(6P4C) 4 Wire RJ11 Male to Male Connectors with a sturdy and thick 28 AWG copper conductors 50 Micron Gold Plating - gives contacts the strongest possible connection and corrosion resistance Pure Copper Core Wires - provide best performance by higher electrical conductivity than aluminum wires Straight Wired for Data and Voice. Connects telephones, modems, Fax and other telephone line devices Precision Hand Made and Tested in USA with Lifetime Warranty This 2.5 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 2.5 foot black RJ11 telephone cord.