Curved perches designed with cardinals in mind. Birds, including cardinals, can perch and eat; squirrels on the perches cause them to collapse. Collapsible, mechanical perch rods are weight-activated using a patented design. Sturdy stainless steel wire will not rust. Metal cap fits snugly so that squirrels cannot pry it off. Seed tube is made of UV stabilized polycarbonate for durability. Tube is long enough so that squirrels can’t hang down from the top and reach seed. Interior is properly baffled to direct seed to the seed ports. Metal parts are powder-coated with a beautiful evening blue finish.