Le Creuset Stoneware Napkin Ring, Fennel High-quality exterior enamel to protect against metal marks and other damage Unmatched thermal resistance from -65f to 500f  safe for the freezer, microwave, oven, broiler and dishwasher Less than 1% porosity, blocking moisture absorption which can lead to cracking, crazing and rippling along the interior A virtually nonstick glazed interior that easily releases foods for quick cleanup A perfectly color-matched palette of bold, consistent tones for easy mixing and matching with other le creuset products