Materials:

Body: Brass
Center Contact: Gold plated brass
Outer Contact: Tarnish Resistant gold plated Beryllium Copper.
Dielectric: Teflon
Gasket/Seals: Silicone rubber
Resistor: Deposited carbon film
Marking: “Pomona 3840”
Label: “TERM, *Ω 1/2W”
Ratings:Frequency Range: DC to 500 MHz
Resistance Tolerance: ± 1%
Power: 1/2W @ 70ºC Max