The Squirrel Buster Suet is a truly squirrel-proof bird feeder. It holds two 5 inch suet cakes. It comes with a cardinal ring for easier perching. Openings in the bottom section of the feeder providing birds access to the suet. When a squirrel climbs onto the feeder, its weight automatically forces the shroud down, closing the ports. Squirrels and large birds are foiled but not harmed in any way.