Question about assembling my own DIY AC Cable

@jea48 I think you are right. I didn’t translate terminology correctly into european plugs.

PS  Do your tube amps not like shielded cables terminated on both ends (may cause ground loop) or were you saying that there is a problem if they are grounded only on one end?

Well as I said they are plated with with oxygen free copper, silver and rhodium. But also on the official website it says pure copper.

You guys raised a concern now, idk if I should send them back :(
This plug here is pure copper, FI-46, Fi-48 and FI-50 are all pure copper

Oyaide indeed uses phosphor bronze and beryllium copper for their more expensive ones. Neotech uses OCC copper.

Idk what to do now, you guys raised a serious concern. It just feelsbad to pay $200+ for 2 connectors if I don’t even have a network streamer or a DDC.

The cable itself costed me $90 for 1.5 meters.

I sent an email to Furutech now and asked them if their copper is alloyed

If you use copper as a base metal in a connector I can guarantee you it's not pure, and that's just fine.

Don’t overthink it. No need to know the molecular breakdown here. Use good connectors and you’ll be fine. 
I suggest contact enhancer mainly to prevent oxidation on bare wires over time from the remnants of oils left from your fingers. Deoxit will do as well.