Office Gift Office work, a source of thought. In order to better protect the desktop, we provided a new thickening design for the coasters. Can be used on variety of tabletop materials: wood, granite, glass, soapstone, sandstone, marble, stone, ceramic, porcelain tables, etc. | Both Sides Are Available The ME.FAN Coasters are grooves pattern on one side to contain liquid to prevent leaking, ripples on the other to stay put on table and prevent coaster from sticking to glassware. | Versatile Coasters Both of the Indoor & Outdoor Choose Theses silicone cup coasters have wide usage, can be used in your home, kitchen, office , bar , and even at Christmas party, outdoor gathering |