Gauge, Steel, Finish and Undercoating GAUGE: The gauge determines the thickness of the steel. The lower the gauge number, the thicker the steel. 18 gauge steel is thicker than a 20 gauge. The thicker the steel, the less susceptible it is to denting. Soci has 3 lines of sinks to choose from, you can select gauge, style and price. Each offers you a superior product. STEEL: There are different types of stainless steel. Soci Sinks are created with 304 series stainless steel. It combines chromium and nickel in exactly the right proportions to make out sinks durable and extremely corrosive resistant. FINISH: For lasting beauty, you should look for a satin polished finish. Soci sinks have a beautiful luster finish that is achieved by both machine and hand finishing operations. This makes your stylish sink easy to maintain year-after-year. UNDERCOATING: All Soci stainless steel sinks have undercoating and a sound deadening pads. This is a very important aspect since it is the undercoating and the sound-deadening pad that eliminates unwanted sounds and ensures adequate water temperature is maintained.