Brome Squirrel Buster® Classic Bird Feeder. The patented Squirrel Buster technology is truly squirrel proof! When a squirrel climbs onto the feeder, its weight automatically forces the shroud down, closing access to the seed ports. All squirrels and large birds are foiled, but not harmed in any way. Squirrel proof. Holds 1.4 quarts of seed. Unique design attracts wide variety of clinging & perching birds. Chew proof. Lifetime Warranty. Perches are removable. Patented seed tube ventilation system.