Steel sinks made of solid stainless material, durable, and immune to rust and corrosion. The gauge measures the thickness of the steel, with a lower number indicating thicker steel. Their underside is often sprayed with a rubberized undercoating to provide a sound-deadening barrier, eliminate condensation, and reduce heat transfer.
Stainless steels are alloys of iron with other metals, containing other elements such as sulphur and carbon, sharing the common properties of not rusting and being able to be polished. Most contain nickel and in contact with skin will release significant quantities of nickel. This then will cause an allergic response. Only one type, ASTM 316LVM F138-97 Grade, is acceptable in new piercings. It releases very little nickel.