Squirrel Buster® Standard Feeder - 1.3lb Capacity - 5in W x 5in L x 13.25in HTruly Squirrel Proof design with an adjustable spring closing mechanism that controls how much weight the metal mesh shroud will support. Birds can land on the perches and feed freely When a squirrel climbs onto the feeder, it's weight automatically forces the shroud down closing access to all seed ports