The Mansfield Montclair Bone 8" Center Drop In Basin Model 269-8-BONE is a Bone 23?x18?oval sink . This lavatory sink is installed by dropping it into a pre made counter top. The Mansfield Montclair Bone 8" Center Drop In Basin Model 269-8-BONE is made of a durable vitreous china material with a concealed overflow. The Mansfield Montclair Bone 4" Center Drop In Basin Model 269-8-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.