It is best to choose stainless steel as the material of the cutter, because stainless steel has the advantages of corrosion resistance, wear resistance and easy cleaning, which can keep the blade sharp and hygienic. Ferroalloy is also a good choice, it has high hardness and durability, and can meet the needs of face knives in the cutting process. Gear shaving cutter heads are generally divided into straight knives and curved knives. The straight knife is suitable for beginners, because its blade is relatively straight, and it is easy to master the cutting angle and strength. Machete is suitable for skilled people, because its blade is curved, which can better adapt to the shape of noodles and cut more smoothly.