The 90mm Pulpboard Coaster material is more durable, it has the ability to absorb liquid and maintain its shape over multiple uses. Perfect for your beer and other cold beverages. Protects your furniture and saves money. The absorbent pulpboard coasters are composed of three layers of materials. The absorbent pulpboard in the middle layer is quite absorbent. The upper and lower white cardboard can be used to print exquisite circle colour patterns, including photos and oil paintings. The water stains on the tabletop and the sides of the coaster can be perfectly absorbed.