Constructed of bird-safe economical medium-density fiberboard (MDF), with a corrugated metal top and hanger. This feeder can easily be cleaned out through a screwdriver-accessible port, features a steel predator guard, and has a 1-1/8in hole size just perfect for Wrens and Chickadees. Assorted colors. Measures 4.75in D x 6in W x 8.375in H