A totally new concept in birdfeeding!The Underneath Bird Feeder is unlike any feeder you’ve ever owned. Seed is dispensed from the bottom where small birds feed from a short perch. It’s squirrel proof and big-bird proof—weather proof and hygienic! And birds pull out only one seed at a time, so there’s less waste. Made of brown PVC. Green Eco-roof comes with squirrel lock. For use with black oil sunflower seed only. Holds 4 pounds of seed. Dimensions are 4 x 4 x 22 inches.