Opinel No7 is the perfect for those who feel that the No6 could be a little larger. The "in-between" size of the No7 classifies this knife as neither small or big. Features X90 Carbon Steel. Made in France since 1890. Note: Carbon steel has a low resistance to corrosion caused by moisture, which means that certain precautionary measures are necessary when using and storing a carbon knives: we recommend that you avoid damp environments and that you dry the blade after each use. Damage caused by corrosion is not covered by warranty.