The base of all of our bird houses and feeders are made of a solid cellular vinyl, a wood alternative that gives you the look and feel of wood, with little maintenance. The end result is an architecturally pleasing house that looks like wood, but lasts like vinyl. The redwood roofs are made to endure the elements year after year.Our copper tops age over time to a natural patina or you may choose a verde roof that will give you the patina look right out of the box!