Two of these are identical in gauge to the smaller rolls we sell. The others lie in between. Whereas the smaller spools of 14 and 18 gauge contain merely 20 and 50 feet, respectively, here you have the economy of scale to a great degree, as you will discover by performing some simple calculations. The 20 gauge is the lightest, and the 14 gauge heaviest, which is how wire works, and which you can gather by reading the descriptions aforesaid.