The range of alloys made use of is stunning: weathering steel for aging, marine-grade light weight aluminum for weight cost savings

https://telegra.ph/Snow-Guard-Stewardship-Designing-in-Copper-for-a-Century-of-Security-07-05

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