[ High-quality clay ] : This drop-in vessel sink is made of real fire-resistant clay, a special white clay that is fired at a high temperature for extremely high strength and durability. The sink surface has high resistance to chipping, abrasion, or scratches and fading, and can maintain beautiful and reliable performance for many years. [ Overflow ] :Comes with an overflow for safety. The purpose of an overflow hole is to prevent water levels from rising too high if the faucet is left on and unattended while the sink fills. [ Three pre-drilled holes ] : 3 pre-drilled holes allow for a 4-inch Centerset Faucet, make installing easy. [ Easy to Clean & Easy to Install] : Smooth non-porous surface is resistant to bacterial growth, with a premium glaze in glossy finish , can make it easy to clean. [ Installation ] : This sink is designed for Drop-In installation . It works perfect with Bathroom Cabinet Vanities Countertops and more . [ About Size ] : Due to the manufacturing process, each sink will vary slightly dimensionally. Actual may vary by 1/4" .