I went over to the local Sears Auto Center to buy these just now. They are really, really, really, cheap. Very thin gauge. The insulation looks to be a very thin and cheap grade vinyl. And the clamps are small and cheap looking. The picture makes the clamps look heavy duty. But they are really flimsy and spindly looking.
Pass.
Honestly, I've had speaker wires in my car that are more heavy grade than these jumper cables.
I'd almost be afraid to wire up two car batteries with these things, for fear of overheating and burning out the wires and insulation on these. Just not worth it at any price, from a safety standpoint. I don't think I would even use these if they were free. I'll call AAA first.
They do have some nicer sets over at Sears. I think I'll wait it out until one of the other sets goes on sale.