Recycled Plastic Tops, Recycled Polycarbonate Tubes, Recycled Metal Ports And Recycled Plastic Bases.12 Inch Tube Holds 1 Pound Of Seed. Search_Phrases: Bird Feeders,Bird,Wild Bird,Feeder,Hummingbird,Audubon/Woodlink,Audubon Woodlink Bird Go Green Thistle Tube Bird Feeder