4Pcs Water Absorption Coasters Diatomite Powerful Water Absorption to Protect Furniture Essential for House Bar OfficeDescription This product is made from pure Diatomite made with non slip mats for the same kinds of Diatomite production process. Diatomite is a sedimentary rock biochemistry from the diatom cell wall deposition surface of a light yellow or light gray, soft texture and light, can be easily pulverized, low density, porous, rough sense, a strong water absorption. Walls painted in Diatomite earth, can help control humidity, temperature interval, noise,