BurndyWeld® Metal is packed in moisture-resistant plastic cartridges that have tight fitting caps. These cartridges, along with the necessary steel discs, are then packed in boxes that are hermetically sealed. This ensures the powder arriving in good condition, always dry and ready for fast positive ignition. BurndyWeld® Metal comes in several types one for Welding copper to copper, copper to steel, copper to rail, copper to cast iron and one for Welding copper to steel for cathodic protection. The Size and weight (in grams) of the cartridge are marked on each individual cartridge.