Review on 🔲 Hotop Self-adhesive Square Cork Coasters Mats Backing Sheets (Pack of 60) - Ideal for Coasters and DIY Crafts Supplies by Autumn Robertson

Right out of the box I was surprised at how thin they are. Rounded corners look better than straight edges. They are very sticky and stick very well to the back of the tile. I had to remove one and although I managed to remove it completely it wasn't easy so adhesion is really good. Because they are so thin, they are flexible and work well for bumps and grooves on the back of the tile. So unless you have a perfectly flat surface to stick them to, I wouldn't choose anything thicker.