The range of alloys used is magnificent: weathering steel for aging, marine-grade light weight aluminum for weight financial savings

https://www.scribd.com/document/1041332768/Customized-Copper-Cupolas-From-Specification-to-Centuries-of-Solution-171009

The range of alloys utilized is spectacular: weathering steel for aging, marine-grade aluminum for weight cost savings, and duplex stainless for corrosion resistance in harsh environments.