Constructed of clear grey 1/2-inch high tempered glass, the Bigio is a dainty slipper vessel sink that is perfect for any decor. Novatto uses advanced technology to produce beautiful glass vessel sinks with unmatched structural integrity and longevity. Internal testing has found their high tempered glass to be very durable and forgiving. Items such as toothbrushes or small jewelry should not scratch the surface. Made with the highest standards of quality and creative design, Novatto sinks add art and function to any bath or powder room. Bigio has a standard 1.75-inch drain opening. The set includes a brushed nickel pop-up drain and matching mounting ring.