STRONG ABSORBENT CERAMIC - Co upper layer is absorbent ceramic, which absorb ability better than normal silicone co to keep your table dry. ANTI WEAR CORK - The back of co is cork to prevent table from scratched and worn. And also provide additional gripping to the land, tightly stick to the desktop, easily handles bumps and drops. SUITABLE SIZE - Co diameter 4inch, suitable for all types of drinking glass like bourbon, highball, lowball, whisky glasses and mugs, tumblers, flasks, making them excellent home bar tools and accessories. EASY TO CLEAN - Spills can be easily wiped off with a damp rag and should not stain if removed in a timely manner. Use warm water and a mild dishwashing detergent or stone safe surface spray to clean. BEAUTIFUL DECORATION AND PRESENTS - Set of 4, the frosted glaze on the surface of the co keeps the pattern bright and never fades that is great to decorate your kitchen, living room, bedroom or office and so on. Perfect to sent to friends as a gift.