Like all traditional jam pans, the Goldman MPassion Jam Pan is made of heat-responsive copper in a wide, shallow design that is ideal for making jam, caramel and other high-sugar delights. The unlined 1.2mm gauge copper promotes extremely even heat distribution and a rapid boil, which helps develop natural fruit pectin. Copper will develop a rich patina over time which will not affect the pans performance. To keep the exterior looking new, use Copperbrill cleaner. Unlined copper sides respond to changes in temperature quickly Tapered sides allow for ease of stirring Wide opening promotes evaporation and easy ladling into jars