Transolid AUDD3120-12 Aversa 31.375-in x 20.5-in x 9.5-in Granite 1-3/4 D-Shape Double Undermount Kitchen Sink, Espresso Granite Material made by the union of 80% quartz and 20% acrylic resin. It is durable and resistant to scracthes, dents, chips and impacts. Stain resistant, non-porous material is hygenic, resistant to bacteria growth and easy to clean up. Heat resistant up to 650 Degree F. Overal Dimensions: 31.375" x 20.5" x 9.5" ; Inner Dimension (Left Bowl): 15.3125" x 18.5" x 8.8125"; Inner Dimension (Right Bowl): 12.875" x 16.0625" x 8.8125"; Minimum Cabinet Size: 33" Undermount installation for seamless visual flow from the counter-top to the sink. This sink is designed and engineered in Italy and comparable to Swan QUDB-3322.170 and Blanco 441597 sinks with at least 30% better thermal and impact resistances. 2 Basket strainers required (not included) for standard 3.5" rear drain locations in each bowl which provide extra usable space under the cabinet