Lead and zinc are both metals and elements that are commonly used in a variety of applications. Lead is a heavy, soft, malleable METAL that is often used in the production of batteries, ammunition, and cable sheathing. Zinc is a bluish-white METAL that is used in galvanizing steel, die casting, and as an alloying agent. Both lead and zinc are essential elements for human health, and are found in trace amounts in the human body.