The triple steel of hemp seed knife is chromium molybdenum vanadium alloy steel. By inquiring about the product description of Wang Mazi's knives, it is known that Wang Mazi's nine kitchen knives are called high-carbon composite steel because the triple steel of Wang Mazi's knives is Cr-Mo-V alloy steel, which belongs to high-carbon composite steel. "Zhang Xiaoquan in the south and Wang Mazi in the north" are two champions in modern scissors industry. Wang Mazi's knife and scissors shop in old Beijing was originally a grocery store selling knives and scissors near the food market outside Xuanwu Gate. The name of the store is "Daoshun".