"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. Application Bird feeder, Mounting Type Hang, Material Polycarbonate tube, Assembly Required Yes, Dimensions L x W x H in. 4 3/4 x 4 3/4 x 21, Includes 4 Seed ports, internal baffles, Capacity 5 lbs. of seed, Compatible With Song birds, UV Inhibitors Yes. Internal baffles keep seeds flowing in the right direction"