Precision Diamante’s Porcelain Undermount Sink is comprised of a Grade A Porcelain and goes through a vitreous china coating process which creates a glossy yet scratch resistant coating that is sure to last for years to come. This highly durable coating is made by heating a special type of refined clay to high temperatures. This layer is also nonporous meaning it is resistant to stains as well as fungi and bacteria growth. Our Porcelain Sinks carry a limited lifetime warranty for as long as the original purchaser owns the home the sink was originally installed in.