The P458 Honed Basalt Black Granite Vessel Sink Is Made From Natural Granite. The Sink Is Carved From A Large Block Of Granite And Hand-Polished For A Smooth, Easy To Clean Finish. This Sink Is Black Granite And Has A Honed, Or Matte, Finish. Since Granite Is A Natural Stone, The Details Will Vary In Color And Pattern From Sink To Sink. A Matching Stone Waterfall Faucet Is Available To Correspond With This Sink. The Overall Dimensions For The P458 Are 16 1/2' X 16 1/2' X 5 1/2' And An 18' Minimum Cabinet Size Is Required. As Always, Our Stone Sinks Are Covered Under A Limited Lifetime Warranty For As Long As You Own The Sink.