Cedar Bluebird Box HouseCedar, bluebird box house, maximum ventilation, elevated mesh base to manage blowflies, predator guards & fledgling skerfs, the naturally insect & rot resistant cedar has a water based preservative the maintains color longer & hinders mold & mildew growth, all hardware is rust free, approved by north American bluebird society by meeting or exceeding their standards, comes with a 5 year warranty.