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

https://tysonzymk871.yousher.com/leader-boxes-developed-to-last-the-architect-s-copper-standard

The series of alloys made use of is magnificent: weathering steel for patina, marine-grade aluminum for weight cost savings, and duplex stainless for deterioration resistance in extreme climates.