Kyocera Advanced Ceramic Revolution Series 7-inch Professional Chef's Knife, Black Handle, White Blade Ceramic blade is made from Kyocera's proprietary zirconia material produced in Japan for exceptional quality and beauty Ultra-sharp, pure advanced ceramic blades will maintain their edge up to 10x longer than steel blades Lightweight and easy to clean, the blades will not brown food, are rust-proof and resistant to acids This professional size blade is ideal for larger slicing tasks that include vegetables, fruits and boneless meats and not to be used on hard or frozen foods