What si this power cable

I have a 20 amp stiff power cable that has a metal outer braiding I need to identify. Light copper in color.

It came with a Tube Research amp. I can send pictures. There are 2 large solid cables under the metal shield or cover.
FIM/CRL/TRL Silver series PC. Paul was FIM cables so now he sells them under TRL.
Ya and they sound awesome. Very stiff but sound great on his gear. What
amp are you using it on?