This Sunflower bird house is made with a 6" diameter kettle gourd, hand-painted with acrylic paint, then coated with 2 coats of sealer. 1-3/8" hole size, great for titmouse, nuthatch, wrens, downy woodpeckers or any similar size bird. For use outdoors, keeping it in the shade, taking indoors in the winter and spraying it with an outdoor polyurethane will make it last for years.