The Sunflower Domed Cage Feeder is perfect for smalle birds. It effectively restricts grey squirrels while allowing songbirds easy clearance. It has a Uv Stabilized Polycarbonate Tube, Stainless Steel Wire, Spring Clamp, and a Sheltering Dome. Product is 15″ Long and 8″ in Diameter. It has a 1Lb capacity with 4 convenient ports.