Aspects' Domes are built to last a lifetime- that's why they carry a Lifetime Guarantee from Aspects. Each is molded from UV stabilized polycarbonate, the strongest and most durable plastic available. Just hang your feeder from the dome to keep weather out and seed dry! All our metal hardware is solid brass or stainless steel. Dimensions: 4.00 x 12.00 x 12.00 Inches.