
These are beautifully machined by AEC in Taiwan. They use a delrin body which means that it's much easier to isolate the RCA from the enclosure. Internal insulation is teflon, and contacts are gold over CuTe (copper tellurium).
The solder tags are prominent and easy to work with. The external grey nut is actually coated brass so it's very robust and turns smoothly on the delrin body. It's very easy to get a tight grip on the enclosure.
And as would be expected from such high quality components, the sound quality is exceptional.
As AEC's minimum order quantity is relatively large, I have some of these for sale on the DIY page at www.aurealisaudio.com.au