I use a 47 Labs OTA cable kit.
The only metal mass in the female RCA is the 26 gauge solid core copper wire used for for the interconnect itself.
I suspect that the non-metal RCA is made of Teflon, but not certain.
DeKay
Are you mass less
It took me a while to really warm up to the mass less ends "eti,aeco,kle"...but i do think that they are for me the way to go...I do have some furutech,dh labs and do like the sound of good copper ends...i mean for years it was kind of hard to think that these gimicky ends could sound so good...Its been some time with them and really liking what im hearing.