Used about 4-5m, the rest is unused. Approximately 15m remaining. Here's the product description from when it was new: This is a gap tape that can be used for windows, doors, etc. You can cut it with scissors and adjust the length to fit the area you want to use it. It can reduce dust between sliding doors and windows, noise when opening and closing, and outside noise. It perfectly seals gaps in doors and windows, preventing air from air conditioners and stoves from leaking out, thus maintaining the room temperature. It's also versatile and can be used not only on windows but also on furniture such as doors and closets. Simply stick the adhesive side to windows or doors, and anyone can easily install it. [Set Contents] Gap tape x 1 roll [Size (approx.)] Total length: 20m, Width: 3cm [Color] Gray [Material] Nylon #window #insulation #gap tape #draft #cold protection #cushioning material