CorningWare 20-Ounce French White Pop-Ins Mugs, Set of 4: * Includes four 20 oz Pop-Ins Mugs * Durable stoneware material * White vented plastic covers * Non-porous surface does not absorb food odors, flavors or stains * Microwave, refrigerator and freezer safe * Designed for use in the oven * Dishwasher safe * Available in various colors