Grommets are made of Heavy duty Brass/Copper, each corner has 3 grommets more grommets are placed evenly along all edges, 12 inches apart vertically, 24 inches horizontally. All edges are covered with black reinforced 3-inch binding (154-inch on each side
Bring up to 90% blockage gives you the privacy you need, not completely blackout but the right amount of privacy and blockage also lets a good amount of airflow passing through reduce wind noise.