CARE AND CLEANING STAINLESS STEEL KITCHEN & BAR SINKS Your BLANCH stainless steel sink is made of 304 series alloy stainless, featuring the highest quality 18/10 chrome-nick! formulation. This elegant, heavy-duty, 18 gauge, non-porous material is hygienic, rust-free, and extremely durable. Our satin polished finish creates an enduring, easy-to-clean luster that is resistant to water stains and calcium deposits. (Nate: these Instructions also apply to our 304 series, 18 gauge.