What are the uniqueness of a Rubine PRESTIGE series kitchen sink? It has ZERO welding and made from durable AISI 304 stainless steel. These sinks are crushed into shape by a 100 tonne hydraulic press machine so it is also named as a one-piece sink. No doubt in the quality but our designer wanted more – a marriage of perfect aesthetic & durability. Thus, a sound deafening pad was added, the base was painted with anti-condensing coating and the corner was crafted to a R70 curve so as to enhance the everlasting look of your total kitchen system.