Even more beautiful in person, Novatto's natural terra cobblestone vessels are sure to add a touch of nature to your bath. These natural cobblestone vessels come from around the world, giving you a one-of-a-kind bath masterpiece. Natural stone cannot be compared to everyday synthetic porcelain and ceramics. These sinks are honed and hand polished to perfection on the inside with a natural exterior. Since these sinks are from Mother Nature, each sink will vary slightly in color, shape and size. Although they are consistent in appearance, we usually send pictures of the one we intend to send for approval. These sinks are constructed for above-counter installation. They have a 1.75-inch drain opening for standard U.S. plumbing connections. Included with the sink is Novatto's oil rubbed bronze umbrella drain (UPD-ORB), constructed of solid brass for strength and durability.For best cleaning results, apply the included Glacier Ice sealer. Going foward a soft cloth with mild soap and water or a non-abrasive stone cleaner is recommended. Novatto strives to provide a superior product with exceptional qualities and unique innovations professionals and homeowners trust.