Our Hong Kong districts map coasters are super absorbent. It is made of absorbent ceramic which is better than normal silicone or wood coasters. You don't have to worry about excess condensation from cold beverages and the coasters could perfectly protect your table from stains or water rings. Our coasters have different colors and printed with Hong Kong 18 districts and tree sparrows. They are perfect housewarming & farewell gift for your family and friends.