SF Cable patch cables are made of 100% bare copper wire and 50 micron gold plated RJ45 plugs. Why 50 micron? We do not use CCA (aluminum wire). What is CCA? Our Cat6 550Mhz Snagless Patch Cables will handle bandwidth intensive applications up to 550 Mhz and beyond.Crossover Ethernet cables are designed to connect two devices, such as computers, game machines directly. Standard Ethernet cables (called "straight through" as opposed to crossover) require that a device be connected to a switch or hub before communicating with another device. A crossover cable switches the wires, allowing the devices to bypass the hub or switch.