SF Cable patch cables are made of 100% bare copper wire and 50 micron gold plated RJ45 plugs. We do not use CCA (Copper Clad Aluminum: aluminum wire) * 25 ft. 32AWG Flat 4pair Stranded Copper Wire * T568B (AT&T 258A) Wired * UTP Unshielded Twist Pair - CM Type PVC Black Jacket * 50 Micron Gold Plated RJ45 Plug - RoHS compliant