A Kitchen Wish Nautical Theme Rustic Wood Design Drink Coasters, Set of 4 4 high quality, round wooden coasters with a sea/nautical theme. The surface of the coasters have a smooth, albeit slightly grainy finish to maintain their rustic looks. Great for both hot and cold drinks. With a size of 10 cm (4 inch), it's suitable for all mugs, cups and glasses. Can be cleaned easily under running water and left to dry.