The Billings 29" undermount kitchen 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 large, deep bowl allows you to soak and clean large cookware and bakeware and has easy-to-clean rounded corners.