This kind of GX12 Circular connector is Economical type, Copper alloy Contact.
Name: circular connector
Model: GX12 -2Pin3pin4Pin5Pin6Pin7Pin
Texture of material: Zinc alloy
Surface treatment: Plate with nickel
Rated current: 5A
Rated voltage: 125v
Installation diameter: 12mm
Contact resistance: 0.005
Ambient temperature: -60+80