United States Air Force Coaster Slate Laser engraved. Each coaster is sealed. The smooth black stone texture adds a touch of luxury to any setting, making these coasters not just functional, but also a stylish addition to your décor. Perfect for use in your home, office, or anywhere you want to add a touch of elegance. The use of natural stone gives our black stone coasters a distinctive appearance but also provides durability and resistance to wear, ensuring they withstand long-term use without easily getting damaged. The natural stone possesses excellent heat conductivity, effectively protecting your tabletops from the impact of hot cups or cold beverages. Each Coaster is equipped with 4 non-slip pads on the bottom. This means they provide a secure grip on any surface, preventing any potential scratches or damage to your furniture. Enjoy your drinks without worrying about the safety of your surfaces. A perfect gift for any occasion. Be it birthdays, housewarming parties, weddings, anniversaries, or any other special event, these coasters are sure to be a hit. With their unique design you can give a gift that is not only practical but also personal and thoughtful. We laser engrave each coaster here in the United States. Special gift for anyone who loves or collects Big Foot Ships 3-5 business days