Those who know the problem is not, on a table Several glasses and nobody knows who that belongs. In this problem, the glass markers provide an excellent solution. They can be super easy to install both at the glass edge, but also at sluices of example champagne glasses. While markers with suckers fall mostly within a very short time, one is with this set on the safe side. Our guests were all enthusiastic about the idea and have concern for the most part already own these rings because they are just super convenient. In addition, they are very robust and do not break when you play around with them and bends up. I have found no drawbacks.