The Cairn sink is made of KOHLER Neoroc, a matte-finish composite material designed for extreme durability and unmatched beauty.Neoroc Cairn 33 Sgl Basin Ada Sink The Cairn ADA-compliant sink offers thoughtful accessibility with a shallow 5in bowl depth and a rear-offset drain location that increases workspace in the sink and space underneath for wheelchair accessibility.. Richly colored to complement any countertop, Neoroc resists scratches, stains, and fading and is highly heat- and impact-resistant.