Transolid RUDJ3118-09 Radius 31.75-in x 19.25-in x 9.5-in Granite 1-3/4 J-Shaped Double 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: 31.75" x 19.25" x 9.5" ; Inner Dimension (Left Bowl): 16.5625" x 15.9375" x 9"; Inner Dimension (Right Bowl): 10.625" x 15.9375" 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 Swan QULD-3322.077, and Blanco 441128 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