Spectra Premium CU478 Complete Radiator Original Equipment (OE) design to ensure exact fit, form and function for an easy drop-in installation Built with high density multi-louvered fins for maximum cooling efficiency. Core Material:Copper All radiators are subjected to an aging and endurance test in order to validate their performance under extreme weather conditions Engineered to stringent tolerances designed by an in house engineering team who have in-depth knowledge of the OE part its designed to replace Gasket and O-rings are thermal shocked to ensure durability in extreme cold weather Original Equipment (OE) design to ensure exact fit, form and function for an easy drop-in installation Built with high density multi-louvered fins for maximum cooling efficiency All radiators are subjected to an aging and endurance test in order to validate their performance under extreme weather conditions Engineered to stringent tolerances designed by an in house engineering team who have in-depth knowledge of the OE part it's designed to replace Gasket and O-rings are thermal shocked to ensure durability in extreme cold weather