The series of alloys utilized is stunning: weathering steel for patina, marine-grade light weight aluminum for weight savings

https://www.scribd.com/document/1041618560/Leader-Boxes-Developed-to-Last-The-Architect-s-Copper-Criterion-223754

The series of alloys utilized is spectacular: weathering steel for aging, marine-grade light weight aluminum for weight financial savings, and duplex stainless for corrosion resistance in extreme climates.