Attract nesting birds to your yard. The Songbird Essentials Wild Bird Nesting Wreath Refill is used with their Wild Bird Nesting Wreath (SEWF9100) NOT INCLUDED. Refill your wreath to keep birds nesting in your backyard. This is the only nesting material available that contains a mixture of 6 natural colored materials preferred by North American nesting birds. This mixture is made up of feathers, Alpaca wool, natural wool, hemp, string, and aspen fiber. Because it contains all the above, this material attracts many more birds than cotton only mixtures. Birds and consumers love it. Plus, it includes twine to reattach all materials to the wreath.