The M86SS is chiseled into a beautiful basin from a large block of natural sandstone. It takes shape as a very thick circular bowl with a sense of roundness throughout. Delicate beige and cream tones swirl throughout the basin creating an intriguing visual display. Both the interior and exterior are gently sanded to a smooth, very matte yet hard-wearing finish. Since sandstone is a natural stone, the details will vary in color and pattern from sink to sink. The overall measurements for the M86SS are 15 1/2" x 15 1/2" x 5 1/4" with a 2" thickness. Its inner depth is 3 3/4" with a centerset drain. As always, our stone sinks are covered under our limited lifetime warranty for as long as you own the sink.