Reliable Ceramic Quality: These oven safe soup bowls are made from healthy, high-quality clay fired at high temperatures. They can withstand up to 482 F and are safe for use in oven, refrigerators, microwaves, and dishwashers; Compared to plastic or stainless steel options, our ceramic crocks stand free from heavy metal contaminants, safeguarding the integrity of your culinary creations; Furthermore, their non-porous composition wards off any infiltration of food odors or flavors.