These coasters are made from hand-painted ceramic tiles that have up-cycled illustrations from Batman: Dark Victory mounted to them with multiple coats of decoupage glue. They were then given a bright, durable, and water-resistant finish with a polyurethane sealer. I try to keep my work environment dust-free, but occasionally coasters will have tiny spots on them from dust. These marks are barely visible, however, and add to the handmade character of the coasters. Although these coasters are water-resistant, they are not dishwasher safe. Each coaster has felt pads on its bottom to prevent scratching. This is an awesome set of coasters, and it would be the perfect gift for any Batman fan. I'm quite tempted to keep these myself!
Note: If you are interested in a set of coasters but you do not see one that you like, feel free to message me, and I would be happy to make one for you.