Folding knife with ViroBlock. These knives are available in bright colors and, of course, in a traditional natural finish. OPINEL VRI Folding knife with ViroBlock. These knives are available in bright colors and, of course, in a traditional natural finish. 95% of the wood from which handles are made comes from sustainably managed French forests. There is no excessive felling of forests and air pollution with a long transport - all of which is less burdened by nature. The main wood supplier has its forest areas in the French Jura region and of course holds a PEFC certificate. The choice of steel is one of the most important materials of the knife itself. It determines the life and quality of the blade itself. High quality Swedish steel 12C27 (Sandvik) has been chosen for Opinel knives. This steel is highly corrosion resistant and easy to maintain thanks to the addition of chromium. The addition of carbon in steel (0.40%) ensures an excellent edge that keeps its shape even when contacted with harder material without the need for grinding.