wow, i bought it about 4 or 5 years ago on ebay and just held on to it thinking i'd use it some how, some day. i did and it is great! i got 2 lengths, 10ft long, one red, the other black. paid about $40 shipped if i remember right. the price was too good to pass up and it was made in the US, not china. sorry i can't help you more.
what most folks don't understand is that electrical current is carried on the OUTSIDE of the wire, NOT through the center of it. so, the more strands you have, the more surface area, thus, more current being carried. and good welding wire with it's thick insulating jacket makes it all that much better.