Cocina 30 Undermount Kitchen Sink. A 30-inch single-basin sink that offers a smart size option while its undermount installation allows for a subtle-yet-splendid display of its distinctive texture. Copper has been used for centuries in kitchens and baths throughout the world; Cocina 30 brings modern functionality to a classic material. ** Due to their handcrafted nature, no two products will be exactly the same and may vary in finish, texture and other details. **