UV-stabilized polycarbonate won't yellow with age. Dependably durable sloped cover overhangs dish and prevents runoff of rain into dish. Open construction for a clear view of birds on the feeder. Three high-quality suction cups hold feeder securely. Dimensions: 7" H x 7" W x 3.5" D. Capacity: 1/2 pound of seed. Can also be used for mealworms, fruit, or suet. Dishwaher safe, designed to be cleaned thoroughly as assembled. Made by Droll Yankees.