About two years ago I received a postcard from the AL & Ed's Store telling me to bring it in and receive $50 of free merchandise - no strings attached. When I got there I saw nothing I wanted so I had them peel off 50 bucks worth of their fattest monster cable.
When I made all of the connections for my new system, this wire appeared identical in size (wire only, not insulation) to the 12 gauge garden wire I'm using with my QS8s. Thus, I reckon it is 12 gauge.
When I bought my receiver at Tweeter's and they tried to sell me every bit of wire and interconnects they could, the manager said, "If you got that from Al & Ed's then it's for car audio and has delays built into the wire." I'm sure my mouth was hanging open. Snake oil salesmen in every store.