Kraus KGU-413B 31 inch Undermount Single Bowl Black Onyx Granite Kitchen Sink Constructed from 80% natural granite. Sink dimensions : 30.47 inches Length X 17.09 inches Width X 8.66 inches Depth Looks and feels like real stone Naturally sound-absorbing non-porous surface is hygienic & heat-resistant Protected by thermal finishing process Highly resistant to heat, chipping, and discoloration