The Droll Yankees New Generation Niger Seed Feeders feature openings for niger seed that have been designed to dispense seed economically. The aluminum perches cannot be chewed and will not injure birds’ feet. The snug fit sliding cap is hard for squirrels to remove. The die cast top, base and ports will last a lifetime. The UV-stabilized polycarbonate tube will not crack or yellow with age and the product is covered by a manufacturers lifetime guarantee against damage by weather or natural predators including squirrels. Choose from three different sizes: 4 ports (180mm), 6 ports (360mm) or 8 ports (540mm).