In-wall cable

I plan on upgrading several of my dedicated lines with this:

Kingrex In Wall Wire

I had stranded wire in old house and love it. One of the solutions would be Southwire MC Armorlite but in that case I would need metal wall box which I would like to avoid

In-wall 10awg wire generally should be solid.

Thank you Mike! Excellent topic! I already contacted Jim who is real expert in this field but can not believe that wire I am looking for could not be made in this country..