Here are the cords that came with the balcony privacy screen I recently purchased. There are two cords, each about 10m long. I used about 60cm from one of them, so there's approximately 19m left in total. (This is an amateur measurement, so it's not exact.) The cords are about 5mm wide and 2mm thick. The color is glossy white. I think they could also be used for crafts, shoelaces, etc. The material is unknown, but it's not cotton; it feels like polyethylene. I think it's durable because it can be used outdoors.