Monoprice's SlimRun™ Cat6 UTP Bulk Ethernet Cables are designed for high density environments where space is a premium. SlimRun cables are roughly half the diameter of ordinary bulk cable (.149" vs .29"), which reduces congestion and simplifies moves, adds, and changes. Monoprice Ethernet cables are made of 100% 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.