Nature's Way Bird Products BWH2 Bamboo Wren Box Bird House Crafted with Solid Cross-Ply Bamboo - 5 X Harder and Stronger than Cedar or Cypress Wood Air Vents Allow for Maximum Air Ventilation Through Wall and Floor Openings Clean-Out Doors Provide Easy Access for Cleaning 1-Inch Hole Keeps Out Sparrows and Larger Birds Pole Mount or Flush Mount Installation Options