Transolid RTDE3322-17 Radius 33.0625-in x 22.0625-in x 9.5-in Granite Double Equal Drop-in Kitchen Sink with 1 Pre-Drilled Faucet Hole, Grey 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: 33.0625" x 22.0625" x 9.5" ; Inner Dimension of both bowls: 13.875" x 16.375" x 9"; Minimum Cabinet Size: 33" Top mount (Drop-in) installation with a fine finished rim to make it a beautiful point in kitchen. This sink is designed and engineered in Italy and comparable to Elkay ELG3322GY0 and Swan QZSQ-3322.173 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