If I wanted to make my own speaker cables, is this a good choice for wire?

Mitch2

I guess next time you will have to use a bullhorn to get me to listen! hehehehe

Using inexpensive CAT6 plenum cable - solid copper, not aluminum, you can make an exceptionally good speaker cable:
(from the silversolids.com Blog)

Jung and Marsh stated that their tests showed that the use of multiple thin gauge solid core wires in parallel was the best way to go. This gives you low capacitance with no phase or skin effect problems in or directly above the audible range.
When asked, "What is the real thing about using silver in audio chain?" Mark Levinson replied: "Silver is the best conductor of electricity. Laws of physics. But copper is more practical for speaker cables.".
For a speaker cable, using just one pair of 23 ga. conductors results in a noticeably lean tonal balance but grouping multiple light-gauge wire gives you an even tonal balance without diminishing the desirable high-frequency performance advantages of thin gauge wires. The most cost effective way of achieving this is using plenum type CAT6 Ethernet cable with eight pure copper 23 gauge solid wires and Teflon dielectric in multiple pairs. Uncompromising high-end caliber performance at a bargain price.
The illustration below shows one side:                                                        

@esarhaddon -all good

@tubeguy76 - the post by @stager2  is true, CAT cable can be used to make really good sounding speaker cables.  Here is an older articles explaining one alternative but there are easier methods, I have no idea which would sound best.

Thanks for the suggestions and tips everybody.  I read every post.  :)

For single driver speakers I suggest using solid core copper (one run for +/one run for -).

With cables 12' or less stay in the 22-26 gauge range unless if you want a "less full" (thinner) sound then go 16-20 gauge.

I use 47 Labs OTA (26 gauge solid core copper in a VERY thick polyvinyl insulation) and recently tried Neotech 24 gauge/Teflon.

The Neotech is readily available (by the foot) and inexpensive.

https://www.soniccraft.com/index.php/neotech-wire-teflon-solid-cu-c-296_175_183_221

I've used (mainly) vintage Elac S517 and Stephens Trusonic 80FR single drivers for the past 20 years and realize that saying that heavier gauge wire reduces bass/fullness seems to go against the grain, but this has been my experience with all of the single driver speakers I've used over the years.

DeKay