The range of alloys used is spectacular: weathering steel for patina, marine-grade aluminum for weight savings

https://www.livebinders.com/b/3711025?tabid=d02e4e31-44e1-a059-326a-7606bd835445

The series of alloys used is spectacular: weathering steel for aging, marine-grade light weight aluminum for weight financial savings, and duplex stainless for rust resistance in rough environments.