... center contacts: Brass, gold plated Female center contacts: Beryllium copper, gold plated Temperature range-65~+165Insulation resistance≥1000MΩCharacteristic Impedancd50Ω/ ... , gold platedMale center contactsBrass , gold platedFemale center contactsBeryllium copper , gold platedInsulatorsPTFESpring contactsBeryllium copper , gold platedCrimp ferrulesCopper alloy , gold or nickel plated smb connector