NEW THICKENED & DEEP TRAY DESIGN: The thickening coaster's thickness is [ 0.28''/ 7 mm], the deep hem design can hold more overflow of water, juice and liquor from the cup. [ Diameter: 3.9''/ 10 cm. ] Big size suits all normal cups or mugs, also enough for large mason jars, flask, tumbler or glassware like beer stein, bourbon glass, cola bottle and pitcher jug NON-SLIP BOTTEM & NON-STICK TOP: Double-sided design, available on both sides. Grooved pattern holds liquid to prevent leaking, raised ripple promote air flow to prevent coaster from sticking to glassware. Relax and enjoy fun time with your family or friends at your house, indoor or outdoor; anywhere from the kitchen, bedroom, drawing room, ball room, wedding, party, library, restaurant, office, bar, pub and beach