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Stainless steel is a generic term for a family of corrosion resistant alloy steels containing 10.5% or more chromium. The chromium reacts with oxygen in the air to form an invisible, protective chrome-oxide surface layer.

ecococoon provides cups and bottles in 18/8 or 304 stainless steel. The first number is the percentage of chromium that is contained in the stainless and the second number relates to the percentage of nickel.