These tiles were a lot of fun to make! They are tumbled tiles that you can pick up at any home store. They are not coated and are rough to the touch. Truly tumbled tiles..... This is the same texture paint that I used on the glass candle holder yesterday. It looks so rustic on the tiles. Wouldn't these be cute displayed in a kitchen or bath? Since they do have dimension, you would have to be careful if you wanted to use it as a coaster. You would also want to seal it if you were planning to use it as a coaster or hot plate. There are so many different mediums that you can use on the tiles. I will share more soon! Enjoy!