Recycled Plastic Wren House doesn't crack, peel, chip, rot or warp. Songbird Essentials plastic products utilize recycled plastic which is composed of post-consumer waste and packaging. Choose the product that lasts forever, keeps plastic out of landfills, and prevents deforestation. Attracts smaller birds such as Wrens & Chickadees. Hinged roof allows easy opening for viewing and cleaning. Plenty of ventilation and drainage. Small hole size excludes Sparrows and Starlings - Entrance hole measures 1 1/8 in. Lifetime guarantee for workmanship. 8.25 x 6 x 7.5