L&M Radiator makes radiators in copper, aluminum, and brass. Copper has strengths in certain areas that better position it for use in radiator applications. For example, while aluminum is less expensive and offers weight savings, copper is stronger and will generally perform better than aluminum in a direct side-by-side comparison. When customers are concerned about weight and cost, they may opt for aluminum instead. Brass is really only used where equipment is used in or near salt water or other corrosive environments.