"Made with a polycarbonate tube that will not crack, haze or yellow, this 21in.L x 4 3/4in.dia. Droll Yankees bird feeder is made bird-safe thanks to the 4 weight-sensitive perches that are designed to attract cardinals, but repel anything that is too heavy, such as squirrels or grackles. U.S.A. Material Polycarbonate tube, Mounting Type Hang, Includes 4 Seed ports, internal baffles, Capacity 5 lbs. of seed, Dimensions L x W x H in. 4 3/4 x 4 3/4 x 21, Application Bird feeder, UV Inhibitors Yes, Compatible With Cardinals. Metal powder-coated cap and base fit snugly on tube"