These coasters are made of high-quality cardboard with a water-absorbing function, designed for single-use. They are lightweight, safe, and resistant to fading or tearing, helping keep your table clean and tidy. Each coaster measures approximately 4 inches (10 cm) in diameter, suitable for both cold and hot beverages. Ideal for use in restaurants, bars, kitchens, dining rooms, dormitories, offices, coffee tables, weddings, parties, and various other occasions.