STANDARD RJ11 PHONE CONNECTORS ON BOTH ENDS - plug and play ready for Connect telephones, fax machines, answering machines, DSL & dial-up modems in homes and offices. 50 MICRON GOLD PLATING - gives contacts the strongest possible connection and corrosion resistance PURE COPPER CORE WIRES - provide the best performance by higher electrical conductivity than aluminum wires MADE FROM HIGH-QUALITY PVC AND COPPER COMPONENTS - Our RJ11 plugs have 50-micron gold connectors for reliable, crystal clear signal. REVERSE WIRING - for Voice. Connects telephones, modems, Fax, and other telephone line devices