4 Beautiful Absorbent Ceramic and Cork Coasters. They?re made of a 100% absorbent ceramic material that keeps your furniture free from stains, beverage condensation, and unsightly water rings. They have a soft cork backing with an excellent anti-skid effect that firmly grips on the surface and also prevents your furniture from being scratched. Suitable for both hot and cold drinks. These coasters soak up the condensation from your cold beverage and also stop hot drinks from burning the tabletops. Perfect for hot drinks like coffee, hot chocolate, or tea, and cold drinks such as water, juice, beer, smoothies, and more.