CorningWare French White Pop-Ins 20-ounce Mug with Blue Vented PlasticCover, White CorningWare Pop-Ins French White 20-ounce Ceramic Mug with Blue Vented Plastic Cover Durable stoneware material designed for use in oven, microwave, refrigerator and freezer CorningWare material resists chipping and cracking Non-porous surface does not absorb food odors, flavors, or stains Dishwasher safe