Nantucket Sinks Glacierstone apron sink is a patented design to retrofit over a standard base cabinet. Double bowl design lets you divide tasks in a modern material! Bottom grids and drains are included with the sink. The sink itself is solid throughout allowing you to buff out any scrapes or scratches with the included pads. Heat resistant to 500 degrees Fahrenheit. You'll also be aided by the included colander drain with its own colander basket for collecting more food scraps than your typical basket strainer. Composite material is sound absorbing and stain-resistant, non-porous surface is hygienic. Features a 15 year warranty against discoloration.