Welcome all martins to this well-crafted House. This 12-room Bird McMansion offers the finest accommodations for your fine feathered friends. The neighborly purple martins are an acrobatic bunch whose menu happens to be mosquitoes and other annoying insects. Truly nature's winged pest-control specialists, they consume many mosquitoes each day! Martins are also the only North American bird that relies entirely on man-made structures for communal nesting. Maintenance-free, UV-protected polypropylene copolymer plastic; Fully ventilated; Drainage for dry nests; 12 compartments, each 6" x 9"; Starling-resistant doors rotate up for inspection; Traction floor with built-in nest bowls.; Simple snap-together assembly, no tools required.; Measures 20" x 21" x 21"h.; Has central opening for adjusting pole; Weighs 10 lbs., 9 oz.; USA made; Mfg. Number: AB.