This is a custom made shielded extension cable to use to extend the CT leads for the 3.5mm inputs.
One end of the cable is terminated with a brass-plated 3.5mm male jack – the other end comes pre-stripped for you to solder to your CT leads.
This cable is not an audio cable. The wiring to the 3.5mm jack is different than a typical audio connector:
Length: 2m / 6ft