A great memento of your time in Oklahoma City, this marble coaster with the Oklahoma City skyline is as beautiful as it is functional. Each piece of marble is carved from large blocks, and no two stones are ever alike! A unique tumbling process gives each stone a personality that can be seen on every surface, edge and corner. Cork is placed on the back of each marble piece, so it won't scratch your surfaces. Clean with a damp cloth. Do not wash in dishwasher.