Transolid AUDE3219-09 Aversa 31.9375-in x 19.125-in x 9.5 Granite Double Equal Undermount Kitchen Sink, Black 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: 31.9375" x 19.125" x 9.5" ; Inner Dimension of both bowls: 14.25" x 17.125" x 9"; 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 Elkay ELGULB3322BK0, Swan QUED-3322.077, and Blanco 440184 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