Lenova LS18503 Apogee 18-Gauge Stainless Steel Single Bowl Rectangle Under-Mount Kitchen Sink, 30-1/8 x 18-Inch Fine quality sink formed of heavy duty 18 gauge, type 304 nickel bearing stainless steel Inside bowl surfaces polished to a uniform satin finish High density sound absorption pads covered with a thick rubberized insulation layer on all bottom surfaces Minimum cabinet size of 33-inches CUPC certified