This is just a heads up for those making their own gas checks from aluminum beverage cans. For years I’ve been drinking a brand of beer and always assumed the cans were aluminum. They have the same shape and thickness as aluminum cans, but one day my son picked up a magnet and it stuck right to it. It had the same color as aluminum, but sure wasn’t. I don’t make my own gas checks, but I don’t want others to accidentally use steel for their gas checks.