these are novelty license plate birdhouses. these birdhouses are wood inside wrapped with these novelty license plates . they will never rust ,color will not fade .they are well vented and the roof comes off for easy clean out .the feed back that we get about these birdhouses that the birds love these houses .people tell us that they have bluebirds , sparrows ,tree swallows, wrens, chickadees, living in these birdhouses.and some tell us that they just use these birdhouses as home decorations