Corningware 20-oz Pop-ins Mug Set Includes 2 Mugs with Vented Plastic Lids (Pool Blue & Blueberry) This 20 ounce meal mug makes it great for Soup, coffee, tea, chili, oatmeal, hot cocoa and more Stoneware is safe to use in microwave, oven, refrigerator, freezer & dishwasher Resists chipping and cracking Non-porous surface does not absorb food odors, flavors or stains Includes patented spill proof vented plastic lid Limited 1-Year Warranty on Corning Ware