For your door, or hang it on a post, tree, clothesline anywhere the birds may find this nest-building helper. The only nesting material available that contains a mixture of five natural-colored materials preferred by North American Nesting Birds! Feathers, String, Cotton, Hemp, and Aspen fiber all included! Because it contains all of the above, Nesting Material attracts many more birds than cotton only mixtures. Birds and consumers love it!