RG59 is comprised of:

• A solid inner conductor that is 0.22 inches (0.56 millimeters) in diameter and made from copper-clad steel (CCS).
• A solid polyethylene (PE) or gas injected foam fluorinated ethylene propylene (FEP) dielectric of 0.146 inches (3.71 millimeters).
• A single outer shielding layer of tinned copper braid with a diameter of 0.165 inches (4.19mm). Coverage can range between 60 and 90 percent depending on the manufacturer.
• A black PVC jacket outer layer of 0.242 inches (6.15 millimeters).