The Mansfield Alto ll 4? center Drop in Lavatory Model 251-4-BONE is a Bone 19?x16?oval sin. This lavatory is installed by dropping it in to a pre cut hole in your counter. The Alto ll 4? center Bone drop in Lavatory Model 251-4-BONE is made of a durable vitreous china material with a concealed overflow. The Alto ll 4? center Bone drop in Lavatory Model 251-4-BONE comes with the limited lifetime Mansfield warranty. Mansfield is an American company that?s been in business since 1929, and has been one of the top producers in design, and quality for the past 80 years. They are the largest domestic producer of sanitary ware, and strive to ensure you get the best products available.