Materials and Platings
•Housing: Nickel or Gold-plated Brass
•Contact: Nickel-plated Brass
•Insulator: ABS
•Hardware: Nickel-plated Brass
Options
•Front or rear mount solder type receptacles
•Jack to jack bulkhead configuration
•Insulator colors
•Gold or nickel plate
https://www.switchcraft.com/Drawings/bpjj_x_series_cd.pdf