Constructed of a maintainence free cellular pvc-vinyl, or a premium grade of white pine, which is primed and ready to coat with a paint of your choice. A good rule of thumb in selecting the right size cupola for your building is a minimum of 1.25" for every foot of unbroken roof ridge line. For example: if a roof section measures 24' the minimum size the cupola should be is 30". For roof lengths 48' and longer you may want to consider using 2 or 3 cupolas.