'18/10' is a designation used on some cutlery and holloware as an alternative to '18/8'. This designation is claimed to indicate a better quality steel than '18/8', and is essentially the same as the '304 (1.4301) grade . In practice the "10" does not indicate an actual higher Ni content and is purely a marketing ploy.
ref: http://www.bssa.org.uk/topics.php?article=91
