These tile coasters are hand painted with acrylic paint and finished with 3 coats of high gloss polycrylic. The patterns are randomized as they were made using an acrylic pour and come in sets of 6 and measure 4x4. The bottom has been painted and rubber feet added to prevent scratches on your tables. Coasters are a wonderful way to add some creative design and color to your home, as well as protect your tabletops. Not dishwasher safe. To clean, just wipe with a lightly damp cloth. Do not hold under direct water. Keep in mind, these are ceramic tiles so they might crack or break if dropped.