This is a RG-58A/U coaxial cable with a 20 AWG solid bare copper conductor, measuring 0.033 inches in diameter. It features FEP Teflon insulation and a tinned copper braid shield with 95% coverage, all inside a Flamarrest plenum-rated jacket. The cable has a characteristic impedance of 53 ohms and is not flooded over the braid, making it suitable for high-performance data and communication applications in plenum environments.