Kyocera Advanced Ceramic Revolution Series 7-inch Professional Chef's Knife, Black Handle, White BladeAdvanced Ceramic Revolution Series 7 inch Professional Chef's Knife, 7 inch 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 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