The PUPMBL porcelain undermount sink is made from true vitreous china which is triple glazed and triple fired to ensure your sink is durable and strong. The black glaze creates a mirror effect for a shiny finish. undermounting a bathroom sink creates a sleek look and allows for more space on your countertop. The overall dimensions for the PUPMBL are 19 in. x 15-1/2 in. x 7-1/4 in. and require a 21 in. minimum cabinet size. As always, our porcelain sinks are covered under a limited lifetime warranty for as long as you own the sink.