Dolphin Drink Coasters make the perfect present for lovers of these smiley sea mammals. If you are enchanted by these graceful animals, the Dolphin coasters make a great gift for yourself too. The Dolphin coaster set contains four coasters that are approximately 4 inches in diameter. The cork-backed drink coasters are made of sandstone, which has natural variations, making each one distinctive. They absorb condensation and drips from cups, mugs and glasses to protect your furniture from damage. With these placed on your tables, soon you and the guests at your next party will be laughing like a school of dolphins.