Joster Coasterica 2-in-1 Flutterbys Silicone Stemware Coaster and Glass Marker, Set of 4 Set of four coasterica stemware coasters by joster slip onto the base of your glass and stay on, catching drips as you mingle and roam Made of flexible silicone, they stretch to fit almost any size glass and provide a non-slip base for added stability Clever design doubles as a glass marker so you'll never lose track of your drink or your coaster Flutterby design with jeweltone butterflies on assorted yellow, blue, red and green coasters Each coaster measures approx, 3-1/3-inch in diameter, to clean, hand wash in warm soapy water