Squirrel proof system with triple tube design uses squirrel’s own weight to block off seed access. Separate 3 cavity design allows for a variety of different seed mixes for 9 feeding stations. Squirrels weight blocks access to food. Adjustable spring tensioner for protection against smaller squirrels.Weight-activated cage blocks access to seed ports under a squirrels weightU-shaped perches8 lb seed capacityNo assembly requiredAttracts everything from cardinals, finches, flickers and grackles to grosbeaks, jays, juncos and kinglets even sparrows, wrens and woodpeckers