They look pretty solid from the pictures, but you never know. I am pretty fuzzy on the gauge size, but it is really up to you. I would assume something like 4 gauge would be plenty.
I am actually a little interested in this since my grounds are a complete mess and as soon as I turn the ignition to the ON position, I lose all radio reception.
$25 isn't much...how about you become a guinea pig and try them out for us?
h: