Oh those Copper Plated Aluminum wires in cables with the 'RCA' brand. For short interconnects probably not much difference. But for long interconnects (maybe 3 meters) 25 feet for sure, they are a poor choice. That aluminum foil shield/return with it's very high end to end resistance may have 25 dB poorer background noise than really good interconnect (think BlueJeans LC-1).
I'm looking at the Mediabridge Stereo RCA cables on Amazon. I currently own a 4ft BJC LC1 and it damn good but I need a minimum 8ft cable right now and the Mediabridge is much cheaper. I contacted them and they said the cable uses a CCA conductor. How about using two Mediabridge subwoofer cables? Those have a lot of sheilding but still CCA.