This panels are made of tightly woven thick material. This is a solid room darkening 14 silver grommet patio unlined panel which comes in a variety of colors to coordinate with any home decor. This room darkening panel is energy efficient, reduce light filtering, and reduce outside noise . The silver grommets allow for you to open and close your curtains easily. To get the most out of the room-darkening qualities, measure a 3-4 of inches beyond the window frame on all sides. To assure the size you will get . This panels approx weight is 3 - 4 lbs each