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

https://telegra.ph/Roofing-Vents-Genuine-Results-Coppers-Honest-Aging-and-Lasting-Function-07-05

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