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Iron Chef's Ceramic Knives all have a zirconium oxide blade, which is second in hardness only to diamonds. The extra sharp blade holds its edge much longer than steel knives and will last years without sharpening. This knife is stain and rust proof and impervious to food acids, which means no metallic taste or smell will be transferred to your food. Easy to use and light weight, only non stick and easy to clean but considered more hygienic than traditional steel knives.