The M86BL is chiseled into a beautiful basin from a large block of natural limestone. It is a very exclusive hand-honed stone vessel, as limestone is only occasionally used in the sink industry. Its wide flat-bottomed trough gives way to its lower corners which sweep upwards and out to form gracefully rounded top corners and sides. Though generally rectangular in shape, the slow curves at each end create an inverted arch profile when viewed from the front. The deep gray-colored stone is buffed to a smooth, durable, matte finish. Overall the sink rises to a 4 7/8" height and measures 22 3/4" x 15" with a 3/4" thickness. Its inner depth is 3 1/2" with a centerset drain. A matching stone waterfall faucet is available to correspond with this sink. As always, our stone sinks are covered under our limited lifetime warranty.