They are plastic curtains made of (PVC) material, an excellent thermal blocker, as it prevents cold or hot heat from entering or leaving the room, and also an insect and dust repellent, so it is used in factories and large stores to allow the entry and exit of people and vehicles and then direct closure after crossing and also maintains the appearance of And the beauty of the place and does not obscure the internal vision, as it is transparent to the penetration of light.