No glue or nails are needed, and you can stick it on a flat surface with just a slightflick during use, even on uneven surfaces. And full of flexibility, can be pulled arbitrarily, and has a super adsorption force! Don't think you can't tear it off if you stick it on, just tear it off from the edge and peel it off easily without leaving a trace. Don’t worry about whether the adhesive on it will not be reused after tearing it off, just rinse it in water to reuse it