18/10 is considered the best grade of stainless steel for its composition - The numbers 18/10 refer to the percentages of chromium and nickel added to prevent rust and enhance shine and durability. Rust spots on stainless steel can occur when the simple product care is not followed correctly. Rest assured signs can be easily removed with cream cleaners should this happen. See our product care page for more information https://robertwelch.com/pages/cutlery-product-care