1- Center Contact: Brass,Gold-plated2- Body-diecast: Brass,Nickel-plated3- Insulation: PTFE4- Electrical Impedance: 50 Ω Frequency Range:0~3 GHz Max. Voltage Rating: 500 volts Withstand Voltage:1000V Insulation Resistance:5000 MΩ V.S.W.R: