Opinel Knife No 9 | Folding Knife Opinel Carbon SteelOpinel Knife No 9 is the first Large Opinel folding knife in the Opinel Knife collection. Features the Virobloc safety ring. Carbon steel folding knife blade (always dry & grease after use to prevent from rusting) Opinel folding knife No 9 is made in France since 1890 Measurements are as follows: 4 5 8" unopened, 8 1 4" opened, 3 9 16"" blade length, 3 4" blade width See other sizes of Opinel knives.