Are these Duelund wires good for interconnects-

Parts Connexion sells a similar product that is designed specifically for interconnects. 

https://www.partsconnexion.com/CONNEXI-85162.html

I used this to create a pair of 16' balanced cables. For the money, they are pretty nice cables. They sound very smooth, but are a little warm sounding and laid back for my taste (and my system). I prefer a more forward presentation with a little more snap to the high frequencies (probably because my high frequency hearing isn't what it used to be). 

I've been listening to these for the past week. I've had them for a few months, but had switched back to my DH Labs Pro Studio cables until this past weekend. These connex cables are growing on me, but I still prefer the Pro Studios which are a little more forward, brighter sounding, and also deliver a bit more detail.

There good if you like cheap stuff that sounds just ok.

Whilst I have found that Duelund wire with cotton/oil insulation is very good for interconnects I now prefer to use Solid Copper with AirLok insulation from VH Audio for many of my DIY cables. It provides more details and better dynamic perofrmance

In some cases I use the Solid silver with AirLok insulation for more details.

Hope that helps