Material: The upper layer of coasters is made of ceramic. The square ceramic coasters can protect your beloved dining table and kitchen countertops from damage from hot water, coffee, and tea Size: Each ceramic coaster features a square design, 3.7 inches in diameter, 0.3 inches thick. Just gently wipe with a damp towel to remove stains or grime from the coaster surface Anti-slip Bottom: The coaster has a cork base. This prevents porcelain from scratching the table or countertop and provides a non-slip surface so you don't have to worry about them slipping off the table Wide Use: Funny pattern design, beautiful and practical. Perfect for home, kitchen, living room, hotel and restaurants. You can use the drink coasters on your dining table, coffee table or even for at the office Great Gifts: Each coaster has a unique pattern and vibrant colors that are resistant to fading. This coaster for desk is a great gifts for family and friends on birthday, Christmas, Valentine's Day, etc