Victorinox 8" x 3" Chinese Cleaver, Curved Blade, Walnut Wood Handle 40090 These knives are specially ground and tempered so that they can be re-sharpened over and over again, keeping a sharp edge throughout their lifetime. High carbon stainless steel blades are hand finished in Switzerland by skilled craftsmen. Wood handles provide good grip, and most people consider them to be the most attractive. The blade is then hardened, tempered, ground down, polished, etched and finished. You can occasionally treat wood handles with mineral oil to prolong their finish.