Goldfinches will feed upside-down but House Finches won't. Ports are positioned below the perches to deter House Finches and House Sparrows. Small sized holes dispense Nyjer economically. Birds must pull seed out. Powder coated zinc die cast top and base - to last a lifetime. The sloped base keeps seed within easy reach of the birds. The UV stabilized polycarbonate seed tube won't degrade in the sunlight. Caps lift off easily to allow re-filling and thorough cleaning and the design of the cap makes it difficult for predators to lift and reach the seed. Your feeders can be hung or pole mounted using Droll Yankees Shepherd's Envy Pole. Cleaning...Please, for the sake of the birds keep your feeders clean. Wash regularly in a 50/50 solution of hot water and white vinegar, rinse thoroughly and refill when completely dry. Dirty feeders spread disease. Seed or Feed Options: Nyjer Seed. Capacity: 2-pound of seed, 8 ports. Dimensions: 6 by 6 by 27 (assembled). Mounting: May be hung or pole mounted. Construction: UV Stabilized Polycarbonate, Stainless Steel bail wire. Goldfinches, Purple Finches, Chickadees, Redpolls, Pine Siskins and more.