Thanks to a tray that snaps down under the weight of anything larger than a songbird, this 21in.L x 4 3/4in.dia. tube bird feeder is completely squirrel proofed. U.S.A. 4 seed ports provide the optimal feeding positions for your birds Internal baffles keep seeds flowing in the right direction Made with a UV-resistant polycarbonate, so the tube wont yellow, crack or break Zinc powder-coated black top, parts and base will not rust Some assembly required