Review on Amazon says 12 gauge. That's a decent price for that specific wire.
I used to have that walled Challenger, then it got totaled...
2015 IASCA Welterweight Champion and Record Holder - 156.0 Avg (No door blockers)
2016 IASCA Welterweight Record Holder - 157.7 Avg (Door blockers used)
Team Sundown Audio & Fullriver Faction Member