Materials:

Body: Gold Plated Beryllium Copper
Center Contact: Gold Plated Beryllium Copper
Dielectric: Teflon per L-P-403
Finish:
Body and Contacts: Gold plated per MIL-G-45204, Type II, Class 2
Marking: “Pomona 4291”

Ratings:

Voltage: Shield/Earth: 30VAC/60VDC Max.
Inner Conductor/Shield: 335VRMS Max.
Operating Temperature: -65ºC (-85ºF) to +165ºC (+329ºF)
Nominal Impedance: 50 Ohms
Frequency Range: 0-12.4 GHz.