Konitz 9-Ounce Writing on White Traveler's Mugs with Silicone Lid, Set of 4 Four 9-Ounce Travel Mugs with reusable Silicone Lids Mugs are made of fine porelain, is practical, no more paper cups needed Fits in car drink holders Dishwasher and Microwave Safe Patented heat shield allows you to carry your beverage comfortably