5/8" Poly-lumber made from recycled plastic and milk jugs; lifetime guarantee to never crack, split or fade. Stainless steel screws and wire mesh. Vinyl coated cable. Roof opens to fill with peanuts or sunflowers. Comes with 15" hanging cable. Holds 1 quart. Attracts Gold Finches, Chickadees, Grosbeaks, Jays, Nuthatches, Juncos, Cardinals, Pine Siskins, Titmice and Woodpeckers if the species are native to the area.