The perfect solution help attract birds to your backyard birdhouse, just locate this wreath of nesting materials close by. Hand on a door, post, tree or anywhere the birds may find this helpful supply of nesting materials. Materials consist of feathers, string, hemp, raffia, natural wool and aspen fibers. More than 50 types of North American birds will use this type of nesting material. Materials woven onto a metal frame. Refills available.