Outside can be found a red liner, otherwise it's a roll of adhesive tape like thousands of others. The tape itself is visually seen quite thick, but thereby also be able to marry slightly uneven surfaces together well.
The color is a standard dark gray, depending on the location might be a different color may be more appropriate. I have to test a footer (veneered chipboard) repaired, which is unfortunately broken at a thin spot. Until now, the connection keeps very well, is a little flexible but does not dissolve. In addition, the bar was still glued to the door frame. 'M Curious if I have to remove it again sometime and how well it works.
From me full five stars. Those looking for a good strong adhesive double-sided tape is very well cared for.