CounterArt WWII Warbird-B-17 Absorbent Coasters in Wooden Holder, Set of 4 Set of 4 absorbent coasters in wooden display holder Coasters are natural stoneware with decorative transfer print Beautiful, colorful design meets high functionality with this coaster gift set Holder is made of durable rubberwood with a clear varnish finish To remove coaster stains, soak coaster in 1 part household bleach and 3 parts water until stain lifts, then rinse and air dry