Fidelity Research interconnect cables

These are FR interconnect cables with Neutric type  plugs and are in great condition.  They sound very good and you can notice the difference in your sound system right away.  They are 3ft in length pair. I don't know their internal construction, since I never seen any FR cables for sale before.  I bought them from a US dealer here on Ebay some years ago.  I have so many interconnect cables I want to clean house  and need to thin it out.   I do have old FR literature that show a pair of similar cables but they are pure silver ones.    I already have them wrapped in a small box ready to mail.  Box is 3", 14", 14".