Even more beautiful in person, Novatto's travertine onyx vessels are sure to add a touch of charm to your bath. These natural cobblestone vessels come from around the world, giving you a one-of-a-kind bath masterpiece. Honed and hand polished to perfection, each irregular vessel is beautifully unique. Since these are from Mother Nature, each sink will vary slightly in color, shape and size. Before shipping a vessel, we will send photos for your approval. These sinks are constructed for above-counter installation. They have a 1.75-inch drain opening for standard plumbing connections. Suggested Novatto umbrella drains: UPD-ORB (oil rubbed bronze), UPD-BN (brushed nickel), and UPD-CH (chrome). For best cleaning results, a soft cloth with mild soap and water or a non-abrasive cleaner is recommended. A stone sealant like Glacier Ice should be used to help protect the surface and allow for easier cleaning. Novatto strives to provide a superior product with exceptional qualities and unique innovations that professionals and homeowners trust.