95% Tinned copper braid for the best signal strength and least interference. UV inhibited white jacket for longest life. GENERAL USAGES: RG58CU for interconnecting electronic equipment. RG6U for Cable TV runs over 35 feet. RG8X for VHF runs less than 50 feet. RG8U or RG213 for VHF runs over 50 feet. RG59U for TV's and some SAT NAVS.