PVC

 PVC or Poly Vinyl Chloride is a highly adaptable and versatile form of plastic that is widely used in the construction industry because of its durability, and simple maintenance. It is mainly characterized by its lightweight, resistance to chemical erosion, and robust nature. 

PVC is durable for exterior use and can hold up to the elements

It looks sharp painted with its natural white for contrast.

It's a great product to use for Mailbox or house numbers.