Healthy Legend Black Blade Deluxe Ceramic kitchen knife set with 4", 5", 6" knives This set consist of a 4", 5", and a 6" black mirror blade ceramic knives. They are all very sharp and sharper than most stainless steel knives. Holds its edge much longer than steel. Lasts many years without sharpening. Our BLACK mirror surface ceramic blade is 20% harder and stronger than the traditional white blade due to the additional heat treated process