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