FREE GRID AND STRAINER! Every one of our fireclay sinks is hand-glazed and fired at over 2300? Fahrenheit for over 20 hours. This intense temperature fuses the glaze and clay together, making it incredibly strong. Fireclay is incomparably smooth, nonporous and the one most damage- and heat-resistant sink material available. Our sinks are also finished with an easy-to-clean coat, which makes this sink simple to maintain and keep its natural beauty shine for years to come. As beautiful as they are practical, our undermount fireclay designs are more than trendy?their classic beauty will make them the stunning focal point of your kitchen for years to come.