Black Box Double-Shielded CAT6 Bulk Cables ensure the performance of your Gigabit Ethernet network in high-noise environments: They feature four individually shielded twisted pairs with foam insulation and foil tape and an overall tinned copper braid to ensure protection against EMI and RFI interference that can distort or destroy your data. Tested to CAT6 standard 250-MHz performance, these cables meet or exceed the industry specification, ensuring the transmission of your voice, data or audio/video signal.