Polymer coating for protection against UV rays from sun and increased durability. * Designed and fit for most of square 12"x12" double tier gazebo (not for hexagon gazebo) * Anti-rust brass grommet rings to ensure proper water drainage * The outer perimeter of the main canopy is 144" x 144". The top tier measures 37" x 37". * Velcro straps allow easy installation and attachment to gazebo.