This sink is made of fireclay which is the highest quality clay sink available, exceeding that of porcelain due to higher baking temperatures and longer baking times. It is made from 100% white clay unlike cast iron sinks which are made from iron and simply coated with a layer of clay. It can withstand the hottest pots & pans without a problem unlike fiberglass sinks. Bottom line these sinks are extremely durable and will stay with you for many years to come.