The Billings 18" undermount bar sink raises the bar on functionality and professional styling with options for custom accessories (sold separately) that integrate seamlessly within the bowl's ledge. The Billings sink is made of KOHLER Neoroc, a matte-finish composite material designed for extreme durability and unmatched beauty. Richly colored to complement any countertop, Neoroc resists scratches, stains, and fading and is highly heat- and impact-resistant. The sink's deep bowl has easy-to-clean rounded corners.