Reusable. Consisted of a toothed strip with a one-way ratcheting hole at one end.
You slide the pointed end into the hole and pull it tight.
If you want to loose it, just use your finger nail to press down the plastic slice in the hole and pull the strip out at the same time.
Used widely bundling interior connecting wire of TV set, computer, home appliances, lamp decor, electric toy,etc.
Also be used for fixing piping of mechanical machine or other things.