Copper cathode.
Stainless steel pipe, galvanized iron piping.
PVC pipe.
Bare bright (millberry, bright & shiny, grade a), clean, uncoated, unalloyed copper wire, usually 1.6 mm, bright/shiny, no insulation, no solder, no paint. .
Metals: copper cathodes / a7 ingots / steel rails
minerals: iron ore / nickel ore
agriculture: corn / soybeans / sugar / wheat
meats: beef / chicken / lamb / pork.