A good knife will serve you well for decades, but even the best ones—like Opinel's terrific pocket knives—need a tune-up every now and again. With this kit, you can keep any blade as sharp as the day you bought it. The 5.5-inch natural sharpening stone, sourced from the French Pyrenees, ensures a razor-sharp edge every time. The 5-ounce can of plant-based maintenance oil greases blades and the Virobloc locking ring, while also conditioning handles and wood cutting boards. And the microfiber cloth is perfect for applying oil to your Opinel products, then wiping clean after.