These heavy duty cable lugs, also known as power lugs, are the absolute best connectors you can put on your cables. They are made by a leading manufacturer of electrical components for transportation and industrial applications - connectors are their whole business. They weigh 50% to 100% more than either the FTZ starter lugs or the Ancor Marine lugs, depending on size. FTZ Power Lugs are made of 99.9% copper, with a substantial tin plating to resist corrosion - recommended for marine applications. Unlike many lugs, the pad is a seamless piece for strength, conductivity, and corrosion resistance. The cable size is stamped on each lug, and the die size is printed on the barrel. Can be crimped or soldered.