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Avoid having excess ethernet cable lying around by building your own cables to the exact length needed using this bulk ethernet copper cable from Monoprice! Monoprice ethernet cables are made of 100 percent pure bare copper wire, as opposed to copper clad aluminum (CCA) wire, and are therefore fully compliant with UL Code 444 and National Electrical Code TIA-568-C.2 fire and safety standards, which require pure bare copper wire in communications cables.