The P058BL 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. Since granite is a natural stone, the details will vary in color and pattern from sink to sink. The overall dimensions for the 850-black are 16 1/2" Diameter x 5 1/2" Height thick 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.