gaucho has been out over twenty years, it is 15 and 1/2 gauge , you do not stretch it as tight as 12 and 1/2 gauge, it is a springy ,twisty type of wire harder to work with,because of the the galvanize it will outlast other wire , I have some built in 1980 still no rust, 12 and 1/2 gauge will start rusting here in 5 to 10 years because of the oil field gas in the air and has to be replaced in 15 yrs. If you ever have to roll it back up it is a pain in the butt , and the barbs are so sharp you are always snagging you cloths or cutting yourself and you sure arn't going to crawl throught it if you have a beer belly, also you do not want to use it were water will wash it down because it is hard to get back up, but the longivity of the wire outweights all the negatives and that is about all that is used in this part of Texas. that all I have used since the 80's