Tired of feeding all your bird seed to the squirrels? The Squirrel Buster Mini uses the squirrel's own weight to shut off access to the seed. Birds, on the other hand, have no trouble accessing the seed. Squirrels soon learn that this feeder is off limits to them. Chew resistant and UV stabilized. 3.9in diameter x 21in high, holds over 1 lb of seed.