15 diameter adjustable dome. UV stabilized polycarbonate, will not yellow, brass rod for durability. Squirrel resistant and small bird selective feeder. Big top feeder green, 3 quart capacity, open platform great for perching birds & eight feed ports perfect for clinging birds. Covered by the droll yankees lifetime warranty. Made in the usa. Dimensions are 15.75 X 8.375 X 15.625 UPC Code = 021964103057