Is this wire UL rate for in wall use?
I bought this product from them. This is simply speaker wire which is a low voltage wire as it always is. As far as I know low voltage wire does not require UL approval, nor is it considered a problem simply b/c it is low voltage. I've bought speaker wire over 30 years and nothing has changed. This particular gauge wire is considered better for sound quality simply b/c of its thickness over others (if you are an audiophile nerd).
Audiophile nerds think Left & Right channels should have the same wire length no matter what (so that sound is delivered on-time to each speaker, no earlier for true stereo). This maybe "old school" and I'm to lazy to research that concern I bought into years ago.
Bottom-line is the product is very good. I used mine for a Sonos Amp hookup recently in August 2014.