Squirrel Buster Plus Feeder, 5.2 lb capacityGuaranteed squirrel proof bird feeder! Effective against red and grey squirrels. Weight adjustable to deter large nuisance birds. Openings in the bottom section of the feeder (shroud) align with 6 seed ports providing birds access to the seed. When a squirrel climbs onto the feeder, its weight automatically forces the shroud down, closing the seed ports. Made of rugged UV filtered ABS and polycarbonate resins and squirrel proof RoxResin material. 5. 2