Cedar, 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.