Because the ceramic knives are made of zirconia, the hardness of the product is determined by the nature of the raw materials of the product. However, it is relatively brittle. The toughness can't cut the hard objects, and it falls easily at high heights, breaks the corners or breaks. Therefore, ceramic knives cannot be chopped, twisted, twisted, ticked, etc.; despite the continuous improvement of product technology in recent years, improvements have been made in this area, which cannot fundamentally solve the inherent nature of this product. When the cutter is ground with a large-sized diamond wheel, the thickness becomes thinner and becomes more brittle. When the handle is installed, the weight is increased, and the drop resistance is also reduced.